At least 27 people have been killed and 40 wounded when suicide bombers attacked buses carrying newly graduated police cadets to the Afghan capital Kabul, government officials said.
The Interior Ministry official, who declined to be named, said details were still being verified.
Two bombs hit vehicles carrying cadets returning from a graduation ceremony on the city's western outskirts.
Paghman District Governor Haji Mohammad Musa Khan told the BBC many more had been injured.
A police official said that, according to preliminary information, three buses were attacked as they approached the Afghan capital from neighbouring Wardak province.
"Initial information we have is that two suicide bombers were involved and there are many casualties," he said, declining to be identified by name.
The bombing was claimed by the Taliban and follows an attack on a bus just over a week ago that killed 14 people.
The dead included Nepali security guards working for the Canadian embassy.