Afghan firefighters spray water on a U.S. armoured vehicle after a suicide attack on the outskirts of Jalalabad, January 5, 2015. A suicide attacker targeted a U.S. convoy on the outskirts of Jalalabad on Monday but so far no causalities have been reported yet, provincial spokesman Ahmadzia Abdulzai said. (Photo by Reuters/Parwiz)

A U.S. soldier investigates the wreckage of a European Union vehicle which was hit by a suicide attack in Kabul January 5, 2015. At least one person was killed and five other were wounded police officials said. (Photo by Omar Sobhani/Reuters)

Afghan firefighters spray water to wash the site of a suicide attack in Kabul January 5, 2015. (Photo by Omar Sobhani/Reuters)

An Afghan security personnel investigates the site of a suicide attack in Kabul January 5, 2015. (Photo by Omar Sobhani/Reuters)

British soldiers block the road at the site of a suicide attack in Kabul January 5, 2015. (Photo by Mohammad Ismail/Reuters)

A British soldier points his weapon at the site of a suicide attack in Kabul January 5, 2015. (Photo by Mohammad Ismail/Reuters)

Afghan men look out from the broken window of a shop after a suicide attack in Kabul January 5, 2015. (Photo by Mohammad Ismail/Reuters)

A British soldier stands guard at a road at the site of a suicide attack in Kabul January 5, 2015. (Photo by Mohammad Ismail/Reuters)

A member of the European Union Police Mission arrives at the site of a suicide attack in Kabul January 5, 2015. (Photo by Omar Sobhani/Reuters)

A U.S. soldier keeps watch as an Afghan police truck transports the wreckage of a European Union vehicle which was hit by a suicide attack in Kabul January 5, 2015. (Photo by Omar Sobhani/Reuters)

Afghans gather at the site of a suicide attack in Kabul January 5, 2015. (Photo by Mohammad Ismail/Reuters)

Afghan forces inspect the site of a roadside bomb explosion in Jalalabad, east of Kabul, Afghanistan, Monday, January 5, 2015. A roadside bomb hit a NATO convoy in eastern Nangahar province, damaging one vehicle but inflicting no casualties, spokesman Capt. Frank Hartnett said. (Photo by AP Photo)

An Afghan policeman holds up his rifle at the site of a suicide attack in Kabul January 5, 2015. (Photo by Mohammad Ismail/Reuters)

Afghans gather at the site of a suicide attack in Kabul January 5, 2015. (Photo by Mohammad Ismail/Reuters)

An Afghan woman cries as she sits inside a car at the site of a suicide attack in Kabul January 5, 2015. (Photo by Mohammad Ismail/Reuters)

U.S. troops keep watch at the site of a suicide attack on the outskirts of Jalalabad, January 5, 2015. (Photo by Reuters/Parwiz)

An Afghan firefighter sprays water on a U.S. armoured vehicle after a suicide attack on the outskirts of Jalalabad, January 5, 2015. (Photo by Reuters/Parwiz)

U.S. troops keep watch at the site of a suicide attack on the outskirts of Jalalabad, January 5, 2015. (Photo by Reuters/Parwiz)