Updated

An Afghan official says that a suicide bomber has attacked a bus carrying trainee policemen, killing 30.

Mousa Rahmati, the district governor of Paghman, says Thursday's attack took place some 20 kilometers west of the Afghan capital, Kabul.

He says the trainee police officers were returning from a training center in Wardak province and were heading to the capital on leave.

The Taliban claimed responsibility for the attack in an email sent to The Associated Press by spokesman Zabihullah Mujahid.

A spokesman for the Interior Ministry confirmed the location of the attack and said a loud explosion had been reported, but he did not have any further details on the incident.