Kabul: At least six people were killed and 12 others injured after a suicide bomb explosion took place outside a military university in Kabul on Tuesday, the Afghan Ministry of Interior confirmed.

"A suicide bomber detonated his explosives-laden car at around 7 a.m. in Char Rahi Qambar locality, Police District 5. As a result, three military personnel and two civilians were killed and 12 people, including five civilians, sustained wounds," Xinhua news agency quoted the Ministry spokesman Nasrat Rahimi as saying.

The blast occurred outside Marshal Fahim National Defense University when military cadets and university staff were arriving and waiting to enter the compound, witnesses told Xinhua.

The explosion also damaged several vehicles running along the busy road, they said.

No group has claimed responsibility for the attack yet.