The Afghan Taliban have claimed responsibility for an attack on Kabul's international airport that killed three American contractors at a military base attached to the airport.
The attacker in the Thursday incident was a Taliban agent who "had penetrated into the security forces and was waiting for such a target for a long time", a spokesperson for the group, Zabiullah Mujahid, said Friday, CNN reported.
"Yesterday in the evening he managed to get to a crowd of invading and infidel American military forces where he turned his gun towards them and opened fire," he added.
A US military official earlier said the three Americans were contractors, not active duty forces.
Earlier, Pentagon sources confirmed a man in an army uniform opened fire Thursday evening inside a military facility at Kabul's international airport, which left three US contractors and an Afghan national dead.