A man clears debris from the tarmac of Jinnah International Airport, after Sunday's attack by Taliban militants on Sunday, in Karachi June 10, 2014. Taliban militants disguised as security forces stormed into Pakistan's busiest airport on Sunday night, triggering an all-night battle in which at least 27 people were killed. REUTERS/Athar Hussain (PAKISTAN - Tags: POLITICS CRIME LAW CIVIL UNREST TPX IMAGES OF THE DAY)

A man pushes a trolley past a damaged building on the tarmac of Jinnah International Airport, a day after Sunday's attack by Taliban militants, in Karachi June 10, 2014. Taliban militants disguised as security forces stormed into Pakistan's busiest airport on Sunday night, triggering an all-night battle in which at least 27 people were killed. REUTERS/Athar Hussain (PAKISTAN - Tags: TRANSPORT CRIME LAW CIVIL UNREST POLITICS TPX IMAGES OF THE DAY)

Planes are seen near a section of a damaged building (L) at Jinnah International Airport, after Sunday's attack by Taliban militants, in Karachi June 10, 2014. Taliban militants disguised as security forces stormed into Pakistan's busiest airport on Sunday night, triggering an all-night battle in which at least 27 people were killed. REUTERS/Athar Hussain (PAKISTAN - Tags: TRANSPORT CIVIL UNREST CRIME LAW POLITICS)

A tractor runs past a damaged building on the tarmac of Jinnah International Airport, after Sunday's attack by Taliban militants, in Karachi June 10, 2014. Taliban militants disguised as security forces stormed into Pakistan's busiest airport on Sunday night, triggering an all-night battle in which at least 27 people were killed. REUTERS/Athar Hussain (PAKISTAN - Tags: TRANSPORT CRIME LAW CIVIL UNREST POLITICS)

Pakistan Army's armoured personal carriers are seen at Jinnah International Airport, after Sunday's attack by Taliban militants, in Karachi June 10, 2014. Taliban militants disguised as security forces stormed into Pakistan's busiest airport on Sunday night, triggering an all-night battle in which at least 27 people were killed. REUTERS/Athar Hussain (PAKISTAN - Tags: TRANSPORT CRIME LAW CIVIL UNREST POLITICS)

Paramilitary soldiers checks a motorist along a street in a neighbourhood, after a gunfire attack on a security academy run by the Airports Security Force (ASF) in Karachi June 10, 2014. Pakistan's Taliban insurgents claimed responsibility for the attack on the security academy at Karachi's airport on Tuesday, less than 48 hours after an all-night siege by Taliban gunmen at Pakistan's busiest airport that killed more than 30 people. REUTERS/Athar Hussain (PAKISTAN - Tags: CIVIL UNREST MILITARY POLITICS)

Paramilitary soldiers on a motorbike lead employees as they evacuate from Jinnah International Airport in Karachi June 9, 2014. Taliban militants disguised as security forces stormed Pakistan's busiest airport on Sunday and at least 27 people were killed in a night-long battle at one of the country's most high-profile targets. REUTERS/Athar Hussain (PAKISTAN - Tags: TRANSPORT CIVIL UNREST TPX IMAGES OF THE DAY)

A man mourns the death of his relative, killed in Sunday's Taliban attack on Jinnah International Airport, outside a hospital morgue in Karachi June 10, 2014. Taliban militants disguised as security forces stormed into Pakistan's busiest airport on Sunday night, triggering an all-night battle in which at least 27 people were killed. REUTERS/Athar Hussain (PAKISTAN - Tags: TRANSPORT CRIME LAW CIVIL UNREST)

Relatives mourn the death of a family member, killed on Sunday's Taliban attack on Jinnah International Airport, outside a hospital morgue in Karachi June 10, 2014. Taliban militants disguised as security forces stormed into Pakistan's busiest airport on Sunday night, triggering an all-night battle in which at least 27 people were killed. REUTERS/Athar Hussain (PAKISTAN - Tags: TRANSPORT CRIME LAW CIVIL UNREST TPX IMAGES OF THE DAY)

Family members gather to get information and to identify the bodies of victims killed on Sunday's Taliban attack on Jinnah International Airport, outside a hospital morgue in Karachi June 10, 2014. Taliban militants disguised as security forces stormed into Pakistan's busiest airport on Sunday night, triggering an all-night battle in which at least 27 people were killed. REUTERS/Athar Hussain (PAKISTAN - Tags: TRANSPORT CRIME LAW CIVIL UNREST)

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF DEATH AND INJURY

Family members gather to identify bodies, killed on Sunday's Taliban attack on Jinnah International Airport, at hospital morgue in Karachi June 10, 2014. Taliban militants disguised as security forces stormed into Pakistan's busiest airport on Sunday night, triggering an all-night battle in which at least 27 people were killed. REUTERS/Athar Hussain (PAKISTAN - Tags: TRANSPORT CRIME LAW POLITICS)

Relatives and Airport Security Force (ASF) soldiers carry the coffin of their colleague, killed on Sunday's Taliban attack on Jinnah International Airport, as they head for the burial ceremony in Karachi June 9, 2014. Taliban militants disguised as security forces stormed Pakistan's busiest airport on June 8, 2014 and at least 27 people were killed in a night-long battle at one of the country's most high-profile targets. REUTERS/Athar Hussain (PAKISTAN - Tags: TRANSPORT CIVIL UNREST MILITARY OBITUARY)

Relatives and colleagues of Airport Security Force (ASF) soldiers killed on Sunday's Taliban attack on Jinnah International Airport, gather to offer funeral prayers at ASF headquarters in Karachi June 9, 2014. Taliban militants disguised as security forces stormed Pakistan's busiest airport on June 8, 2014 and at least 27 people were killed in a night-long battle at one of the country's most high-profile targets. REUTERS/Athar Hussain (PAKISTAN - Tags: TRANSPORT CIVIL UNREST MILITARY OBITUARY)

Members of the Bomb Disposal Squad (BDS) defuse explosives and hand grenades along a sidewalk outside Jinnah International Airport in Karachi June 9, 2014. Taliban militants disguised as security forces stormed Pakistan's busiest airport on Sunday and at least 27 people were killed in a night-long battle at one of the country's most high-profile targets. REUTERS/Athar Hussain (PAKISTAN - Tags: TRANSPORT CIVIL UNREST)

A policeman arranges weapons seized after an attack on Jinnah International Airport in Karachi June 9, 2014. Taliban militants disguised as security forces stormed Pakistan's busiest airport on Sunday and at least 27 people were killed in a night-long battle at one of the country's most high-profile targets. REUTERS/Athar Hussain (PAKISTAN - Tags: TRANSPORT CIVIL UNREST)

Smoke billows from Jinnah International Airport in Karachi June 9, 2014. Gunmen attacked one of Pakistan's biggest airports on Sunday and at least 23 people were killed, including all 10 of the attackers, media reported. REUTERS/Athar Hussain

Paramilitary soldiers arrive at Jinnah International Airport in Karachi June 9, 2014. Gunmen attacked one of Pakistan's biggest airports in Karachi on Sunday, killing at least five people, police said. REUTERS/Athar Hussain

A policeman with a gun stands guard on a vehicle as smoke billows from Jinnah International Airport in Karachi June 9, 2014. Gunmen attacked one of Pakistan's biggest airports in Karachi on Sunday, killing at least five people, police said. REUTERS/Athar Hussain

Paramilitary soldiers arrive at Jinnah International Airport in Karachi June 9, 2014. Gunmen attacked one of Pakistan's biggest airports in Karachi on Sunday, killing at least five people, police said. REUTERS/Athar Hussain

A policeman with a gun stands on a vehicle as smoke billows from Jinnah International airport in Karachi June 9, 2014. Gunmen attacked one of Pakistan's biggest airports in Karachi on Sunday, killing at least five people, police said. REUTERS/Athar Hussain

Pakistan Army soldiers arrive at Jinnah International Airport in Karachi June 9, 2014. Gunmen attacked one of Pakistan's biggest airports in Karachi on Sunday, killing at least five people, police said. REUTERS/Athar Hussain

A paramilitary soldier stands in position outside Jinnah International Airport in Karachi June 9, 2014. Gunmen attacked one of Pakistan's biggest airports in Karachi on Sunday, killing at least five people, police said. REUTERS/Athar Hussain

An injured paramilitary soldier talks on a mobile phone while being taken to hospital in an ambulance, after an attack on Jinnah International Airport in Karachi June 9, 2014. Gunmen attacked one of Pakistan's biggest airports in Karachi on Sunday, killing at least five people, police said. REUTERS/Athar Hussain

Smoke billows from Jinnah International Airport in Karachi June 9, 2014. Gunmen attacked one of Pakistan's biggest airports in Karachi on Sunday, killing at least five people, police said. REUTERS/Athar Hussain