For first time, Turkey fires on Syria

Syrian rebel fighters look at a multirocket launcher in Tal Abyadh, a Syrian town close to the Turkish border, on Thursday, October 4. Tensions rippled across Turkey a day after Syrian shelling struck a Turkish border town and killed five people. See more of CNN's best photography.

Rebels climb the stairs of a destroyed building Thursday in Tal Abyadh.

Smoke rises from the explosion area after several Syrian shells crashed inside the town of Akcakale in Turkey, killing at least five people on Wednesday, October 3. It wasn't the first deadly cross-border incident between the two neighbors during the 18-month-long uprising in Syria.

A police officer is injured in Wednesday's attack on Akcakale in Turkey's Sanliurfa province.

Three car bombs destroyed the area around a military officers' club and a hotel in Aleppo, Syria, on Wednesday. At least 40 people were killed and 90 wounded, most of them soldiers, a monitoring group said.

Car bomb explosions on Wednesday left a crater in the ground.

A nurse helps treat a 7-year-old girl who's neck was badly wounded by shrapnel at the Dar Al Shifaa hospital in Aleppo on Monday, October 1.

Friends lay a rebel fighter on a gurney after he was shot in the chest during heavy battles in the Midan neighborhood on Monday.

A Syrian rebel fires toward regime forces as his comrade ducks for cover during clashes in Aleppo in northern Syria on Sunday, September 30.

Smoke billows from a burning textile factory after Syrian regime forces shelled a nearby position held by rebels in Aleppo on Sunday.

Forces loyal to Syria's President Bashar al-Assad patrol the Tal-al-Zrazir neighborhood in Aleppo on Saturday, September 29.

Assad forces patrol the Tal-al-Zrazir neighborhood in Aleppo on Saturday.

Syrian rebels take their position during fighting with government troops in Aleppo on Friday, September 28. Syrian forces clashed with opposition fighters in the nation's largest city after the launch of a "decisive battle" to push regime soldiers out, opposition activists said.

Rebels hold their posts near Syrian government troops during fighting in Aleppo on Thursday, September 27.

A Syrian rebel fighter arrives to help comrades in Aleppo on Thursday.

A rebel fighter looks out a doorway during fighting in Aleppo on Thursday.

Syrian rebels take position with an anti-aircraft heavy machine gun in the northern city of Aleppo on Wednesday, September 26.

A rebel fighter gets carried down a ladder from a third-story apartment after a Syrian government tank shell wounded him during an intense battle Wednesday in Aleppo.

Syrian soldiers stand at the site of bombings Wednesday near the headquarters of the armed forces general staff in Damascus. The government said a fight was under way to "cleanse" rebels from the targeted building -- the office of the joint chiefs of staff -- but military officials are fine.

Smoke rises from the site of the explosion Wednesday in Damascus. The Free Syrian Army, a group battling government forces, claimed responsibility for Wednesday's attack.

Syrian troops walk down a street Tuesday, September 25, in Aleppo following fighting between government forces and rebels.

A school building that was occupied by security forces and pro-government militias was reportedly destroyed by rebel-planted bombs in Damascus on Tuesday.

Firefighters stand among debris from the destroyed school building in Damascus on Tuesday.

A member of the Syrian government forces walks down a street strewn with debris in Aleppo on Monday, September 24.

Rubble surrounds buildings destroyed by fighting between Syrian government troops and rebel forces in Aleppo on Monday.

Soldiers loyal to President Bashar al-Assad travel in a Syrian Army tank in Aleppo on Sunday, September 23, after clashes between Free Syrian Army fighters and regime forces.

Syrian Army soldiers run in a damaged area in Aleppo on Sunday.

Damaged vehicles and rubble litter a street in Aleppo on Sunday.

A wounded boy cries during treatment at a hospital after being shot by a sniper in Aleppo, Syria, on Friday, September 21.

A Syrian rebel is comforted by a friend as he mourns the death of a comrade at a hospital in Aleppo on Friday.

A Syrian woman prepares to grab a bag of belongings as she stands amid rubble at a house where a child was killed Friday.

Syrian women walk past closed shops in Aleppo on Friday.

Men carry the covered body of a child killed in an attack by Syrian government forces in Aleppo on Friday.

Friday's attack by Syrian forces leaves a hole in a house in Aleppo where a child was killed.

Forces loyal to President Bashar al-Assad appear in Aleppo's Suleiman al-Halabi neighborhood Thursday, September 20.

Syrian troops look at a map of the Suleiman al-Halabi neighborhood in Aleppo on Thursday.

Damaged buildings and cars are seen in the al-Midan neighborhood of Aleppo after Free Syrian Army fighters and forces loyal to President Bashar al-Assad clashed on Thursday.

Fighters and civilians walk past buildings damaged during fighting between rebel and government forces in Aleppo on Thursday.

Syrian rebel fighters in position at a deserted market in Aleppo on Thursday.

Syrian rebel fighters man a checkpoint in Aleppo on Thursday.

Syrian Army soldiers run in a damaged area at al-Arqoub neighbourhood on Sunday.

Volunteers for the Amr Ibn Al-Aass brigade load their rifles during training on the outskirts of Azaz, in northern Syria, on September 19.

Brigade volunteers run as part of their training on the outskirts of Azaz, in northern Syria, on Wednesday.

Volunteers stand in lines during their training sesssion on Wednesday.

Volunteers train with rifles on the outskirts of Azaz on Wednesday.

Civilians and members of the Free Syrian Army inspect a damaged building in al-Kalaseh neighborhood in Aleppo after an airstrike Wednesday.

People pull out bodies from under the rubble of a destroyed building in Aleppo on Wednesday.

Construction equipment is used at the Aleppo site on Wednesday.

Syrian rebels help a wounded comrade to an Aleppo hospital after he was injured in a Syrian army strike on Tuesday, September 18.

The survivor of a strike by Syrian regime forces arrives at a hospital in the Sheikh Fares district of Aleppo on Tuesday.

A Syrian rebel gestures as he waits to be treated for his wounds at an Aleppo hospital on Tuesday.

A Syrian rebel holds AK-47 rifles belonging to wounded comrades at the entrance to an Aleppo hospital on Tuesday.

Members of a Syrian family cry outside an Aleppo hospital after surviving a strike by Syrian regime forces on Tuesday.

Free Syrian Army rebels use a mirror to scope out a nearby Syrian army outpost in Aleppo's Old City on Sunday, September 16.

A Free Syrian Army fighter yells "Allahu Akbar!" (Arabic for "God is great!") as he mans a position with his comrades Sunday in Aleppo, Syria's largest city.

A Free Syrian Army fighter patrols a street near Aleppo's Old City on Sunday.

A Free Syrian Army rebel checks a Dragunov sniper rifle Sunday near Aleppo.

A Free Syrian Army fighter moves inside an artillery-shelled mosque Sunday in Aleppo.

A Syrian man inspects damage from an air raid by regime forces in Al-Bab, 20 miles northeast of Syria's commercial capital, Aleppo, on Saturday, September 15.

Syrian men sift through the rubble of houses in al-Bab on Saturday.

A wounded Syrian man is taken to a hospital after surviving an air raid by regime forces in Al-Bab on Saturday.

Syrian rebels prepare to fire during clashes with regime forces as they stand near a picture of Syrian President Bashar al-Assad used as a mock sniper target in Aleppo on Friday, September 14.

Syrian rebels take position during clashes with regime forces in the northern city of Aleppo on Friday, September 14. Syrian regime forces used fighter jets and helicopter gunships to pound the city and province of Aleppo, where fierce clashes raged around a military airport, monitors said.

A Syrian rebel fires at a position held by regime forces during clashes on Friday in Aleppo.

A Syrian man carrying grocery bags tries to dodge sniper fire as he runs through an alley near a checkpoint manned by the Free Syria Army in Aleppo on Friday.

Fighters with the Free Syria Army regroup at their base in Azaz, a city north of Aleppo, on Thursday, September 13.

Syrian volunteers distribute food to residents Thursday in Aleppo.

A Syrian rebel fighter takes a position in the Saif al-Dawla neighborhood of Aleppo on Wednesday, September 12.

A Syrian rebel fighter patrols the Saif al-Dawla neighborhood on Wednesday.

People inspect the damage in Aleppo's Hananu district after it was shelled heavily in an airstrike on Wednesday, September 12.

Syrian rebel commander Abu Mohammed, far right, listens to reports from fellow fighters at his base in the Old City neighborhood of Aleppo on Wednesday.

Syrian rebels gather around a bucket of mortars while fighting with scarce ammunition in the Saif al-Dawla neighborhood of Aleppo on Wednesday.

Members of Lebanese security forces stand guard after escorting the newly released Aydin Tufan Tekin, a Turkish national abducted by a Lebanese Shiite clan in Beirut, to the Lebanese General Security in Beirut, on Tuesday, September 11. The hostage was a Turkish businessman abducted in mid-August, along with around 20 Syrians, to put pressure on rebels in Syria who had seized one of their kinsmen in Damascus.

A Syrian rebel sniper shoots at forces loyal to Syrian President Bashar al-Assad in the Seif al-Dawla area in the embattled northern Syrian city of Aleppo on Monday, September 10.

An armed fighter of the Free Syrian Army stands atop a destroyed Syrian army tank to have his picture taken by a passer-by in the northern Syrian town of Azaz, some 47 kilometers north of Aleppo, on Monday.

People walk past a row of destroyed buildings near the Al-Hayat Hospital in Aleppo on Monday.

A member of the Free Syrian Army enjoys an ice cream on the road from Azaz to Aleppo on Monday.

A house in the Seif al-Dawla area of Aleppo is severely damaged after clashes between rebels and government forces loyal to President Bashar al-Assad on Monday.

The bodies of Syrian civilians killed during shelling by forces loyal to Bashar al-Assad are loaded on the back of a pickup truck to be transferred for burial in Aleppo on Sunday, September 9.

A Free Syria Army fighter fires his weapon during heavy clashes with government forces in the Izza neighbourhood of Aleppo on Sunday.

Syrian government forces take position in a residential neighbourhood in Aleppo on Saturday, September 8.

An abandoned pet tortoise walks on the debris of a damaged house in the neighborhood of old Homs on Sunday.

Free Syrian Army fighters battle during street fighting against Syrian government forces on Saturday, September 8, in Aleppo, Syria.

A wounded rebel fighter is helped by fellow fighters during clashes with forces loyal to president Bashar al-Assad in Aleppo on Saturday.

Residents walk down a street covered in rubble in the neighborhood of Bustan al-Basha on Saturday.

A car bomb exploded in Damascus, the Syrian capital , on Friday, September 7. State television said it was the second blast in a day against government targets. No casualties had yet been reported.

Syrian workers remove damaged vehicles from the site where a booby-trapped car exploded in the suburb of Mazzah, Damascus, on Friday. According to media reports, one person was injured in the explosion, which caused material damage to the area.

Civilians stand near a bomb crater after a Syrian air force fighter jet dropped a bomb on Wednesday, September 5, in Azaz, a town north of Aleppo.

Free Syrian Army fighters sleep in a room in Aleppo on Wednesday.

Smoke rises after a Syrian air force fighter jet launched missiles Wednesday at El Edaa district in Aleppo, Syria's largest city.

Rebels carry the body of a fellow fighter after a sniper shot him in Aleppo on Tuesday, September 4.

Im Al-Zinar church shows damage Tuesday in the western city of Homs.

Free Syrian Army fighters take up positions in a shelled out building in the Seif El Dawla neighborhood of Aleppo on Sunday, September 2, as clashes with Syrian government forces continue.

A Free Syrian Army fighter peeks around the corner of a building during a shootout with snipers on a street in the El Amreeyeh neighborhood of Aleppo.

Syrian detainees who were arrested for participation in protests against Syrian President Bashar al-Assad's regime sign their release papers at the Damascus police leadership building Saturday, September 1.

Syrian prisoners wait in line to sign their release papers at the Damascus central police station on Saturday, as the authorities released 158 people from the facility.

Syrian prisoners congratulate each other as they walk out of the Damascus central police station.

A Syrian air force fighter jet launches missiles at El Edaa district in Syria's northwestern city of Aleppo. Nearly 18 months of violence have left thousands dead in Syria.

Smoke rises from the El Edaa district after a Syrian fighter jet dropped missiles.

Civilians carry their belongings and flee the El Edaa district after an airstrike.

Escaping civilians drive through the El Amreeyeh neighborhood in Aleppo.

Free Syrian Army fighters transport explosives on a motorbike in Aleppo on Friday, August 31.

A boy sits at a window spotted with bullet holes at a local bakery.

Children pass a bagged body outside a hospital in Aleppo on Thursday, August 30.

Members of the Syrian opposition carry a wounded man outside a hospital in Aleppo on Thursday, August 30.

A Free Syrian Army fighter walks through a hole in a damaged house on his way to the El Amreeyeh neighborhood frontline during clashes with government forces in Aleppo.

Free Syrian Army fighters take up position during clashes in the El Amreeyeh neighborhood of Aleppo.

Free Syrian Army fighters run for cover after Syrian forces fired a mortar in El Amreeyeh.

A Syrian opposition fighter aims a sniper rifle at government forces in Aleppo on Wednesday, August 29.

Syrian opposition fighters swear an oath for the liberation of Syria in Aleppo on Wednesday.

Free Syrian Army fighters carry a wounded member into a hospital in Aleppo on Tuesday, August 28.

Free Syrian Army rebels dodge fire from Syrian forces as they run down a street in Aleppo on Tuesday.

A rebel fighter takes cover during clashes Tuesday with government forces in Aleppo.

An opposition fighter fires at government forces from a street in Aleppo.

Residents walk past buildings damaged in what activists said was an airstrike by the Syrian air force on Kafranbel, near Idlib.

Doctors treat a wounded girl at a hospital in Aleppo, Syria's largest city, on Tuesday.

Residents look over the bodies of people killed in the violence Tuesday.

Civilians flee the violence from the Damascus suburb of Kafr Batna.

A man reacts as an ambulance arrives with the body of a Free Syrian Army fighter outside a hospital in Aleppo.

A paramedic and another man cover the body of a Free Syrian Army fighter outside a hospital in Aleppo.

Smoke rises in the Damascus suburb of Ain Terma during clashes between Syrian rebels and pro-government forces.

A boy rides a bicycle toward fuel trucks struck by missiles from fighter jets in the Bab al-Nayrab district of Aleppo, Syria, on Monday, August 27.

Fuel tankers smoke and smolder after being struck by missiles in Aleppo on Monday.

Syrian army fighters discuss a new tactic to push the front lines in the Seif El Dawla neighborhood of Aleppo on Monday.

A Free Syrian Army sniper takes his position in Seif El Dawla on Monday.