An Afghan policeman stands guard as smoke and flames rise from the site of a huge blast struck near the entrance of Kabul's international airport, in Kabul on August 10, 2015. A huge blast struck near the entrance of Kabul's international airport on August 10 during the peak lunchtime period, officials said, warning that heavy casualties were expected. “The explosion occurred at the first check point of Kabul airport”, said deputy Kabul police chief Sayed Gul Agha Rouhani. (Photo by Shah Marai/AFP Photo)

Policemen stand at the site of a car bomb blast at the entrance gate to the Kabul airport in Afghanistan August 10, 2015. A car bomb exploded near the entrance to Kabul airport and casualties are feared, officials said on Monday, days after series of suicide attacks in the Afghan capital killed dozens and wounded hundreds. (Photo by Ahmad Masood/Reuters)

A policeman stands guard as fire is being extinguished after a car bomb at the entrance gate to the Kabul airport in Afghanistan August 10, 2015. (Photo by Ahmad Masood/Reuters)

Men carry a casualty to an ambulance at the site of a car bomb blast at the entrance gate to the Kabul airport in Afghanistan August 10, 2015. (Photo by Ahmad Masood/Reuters)

Members of an Afghan family look out from a broken window of a house near the site of a car bomb blast at the entrance gate to the Kabul airport, Afghanistan August 10, 2015. (Photo by Mohammad Ismail/Reuters)

An Afghan National Army soldier asks public to leave after a car bomb blast, at the entrance gate to the Kabul airport in Afghanistan August 10, 2015. (Photo by Ahmad Masood/Reuters)

An Afghan man receives treatment at a hospital after a suicide car bomb in Kabul, Afghanistan August 10, 2015. (Photo by Omar Sobhani/Reuters)

People help casualties at the site of a car bomb blast at the entrance gate to the Kabul airport in Afghanistan August 10, 2015. (Photo by Ahmad Masood/Reuters)

An Afghan security personnel holds his gun as he keeps watch near the site of a car bomb blast at the entrance gate to the Kabul airport in Afghanistan August 10, 2015. (Photo by Ahmad Masood/Reuters)

Afghan policemen arrive at the site of a car bomb attack in Kabul, Afghanistan August 10, 2015. (Photo by Omar Sobhani/Reuters)

Afghan policemen keep watch at a security tower after a suicide car bomb in Kabul, Afghanistan August 10, 2015. (Photo by Omar Sobhani/Reuters)

An Afghan boy receives treatment at a hospital after a suicide car bomb in Kabul, Afghanistan August 10, 2015. (Photo by Omar Sobhani/Reuters)

An Afghan man receives treatment at a hospital after a suicide car bomb in Kabul, Afghanistan August 10, 2015. (Photo by Omar Sobhani/Reuters)

Afghan workers clear debris from the site of a car bomb blast at the entrance gate to the Kabul airport, Afghanistan August 10, 2015. (Photo by Mohammad Ismail/Reuters)

A boy stands at the door of his house in front of broken glasses scattered on the ground near the site of a car bomb blast at the entrance gate to Kabul airport, Afghanistan August 10, 2015. (Photo by Mohammad Ismail/Reuters)

A policeman walks at the site of a car bomb blast as fire is being extinguished at the entrance gate to the Kabul airport in Afghanistan August 10, 2015. (Photo by Ahmad Masood/Reuters)

Children look out from the broken window of a house near the site of a car bomb blast at the entrance gate to Kabul airport, Afghanistan August 10, 2015. (Photo by Mohammad Ismail/Reuters)

Plainclothes police officers and forensic experts examine the scene after an attack on a police station in Istanbul, Turkey, August 10, 2015. Overnight, a vehicle laden with explosives was used in the attack on the police station in the Istanbul district of Sultanbeyli at around 01:00 on Monday (22:00GMT on Sunday), injuring three police officers and seven civilians, police said. (Photo by Huseyin Aldemir/Reuters)

Police forensic experts examine the scene after an attack on a police station in Istanbul, Turkey, August 10, 2015. (Photo by Huseyin Aldemir/Reuters)

Members of a police special forces unit are seen on patrol following an attack on a police station in Istanbul, Turkey, August 10, 2015. (Photo by Huseyin Aldemir/Reuters)

Members of police special forces unit patrol following an attack on a police station in Istanbul, Turkey, August 10, 2015. (Photo by Huseyin Aldemir/Reuters)

A boy watches in front of a police barrier after an attack on a police station in Istanbul, Turkey August 10, 2015. Four Turkish police officers were confirmed dead and one wounded by roadside explosives in an attack by Kurdish militants, the governor's office in the southeast Sirnak province said on Monday. (Photo by Huseyin Aldemir/Reuters)

A police investigator takes pictures of a vehicle after an attack on a police station in Istanbul, Turkey, August 10, 2015. (Photo by Huseyin Aldemir/Reuters)

Damaged police station is seen after an attack in Istanbul, Turkey, August 10, 2015. (Photo by Huseyin Aldemir/Reuters)

Workers cover a police station damaged after an attack in Istanbul, Turkey, August 10, 2015. (Photo by Huseyin Aldemir/Reuters)

A damaged police station is seen after an attack in Istanbul, Turkey, August 10, 2015. (Photo by Huseyin Aldemir/Reuters)

A woman takes a piece of glass from her shattered window, damaged after an attack on a nearby police station in Istanbul, Turkey, August 10, 2015. (Photo by Huseyin Aldemir/Reuters)

A woman looks on from her shattered window, damaged after an attack on a nearby police station in Istanbul, Turkey, August 10, 2015. (Photo by Huseyin Aldemir/Reuters)

People stand in front of a building damaged after an attack on a nearby police station in Istanbul, Turkey, August 10, 2015. (Photo by Huseyin Aldemir/Reuters)

People look at a police station which was damaged during an attack in Istanbul, Turkey August 10, 2015. (Photo by Huseyin Aldemir/Reuters)

A member of the police special forces sits on top of an armed vehicle outside a police station after an attack in Istanbul, Turkey, August 10, 2015. (Photo by Huseyin Aldemir/Reuters)

People stand next to an armed vehicle of the police special forces outside a police station after an attack in Istanbul, Turkey, August 10, 2015. (Photo by Huseyin Aldemir/Reuters)