Provincial police chief Mirwais Noorzai said the cause of the crash was not yet known and was under investigation. The Defense Ministry said the crash was believed to be caused by a technical problem, but provided no further details.
Meanwhile, in eastern Logar province, a suicide bomber exploded a truck loaded with explosives outside provincial government offices, killing eight people and wounding another 12.
Din Mohammad Darwish, spokesman for the governor of Logar province, near Kabul, said the dead from Thursday’s attack included three police officers and five civilians. Five police were among the wounded.
The massive blast, in provincial capital Puli Alam, blew out windows in buildings 500 meters (1,600 feet) away, he said.
The Taliban claimed responsibility for the attack in a statement, saying the targets were military and paramilitary units.
The Taliban insurgency is currently in turmoil, following confirmation of the death of its leader, Mullah Mohammad Omar. Afghan authorities say he died in a Pakistani hospital more than two years ago.