At least three teachers have died and 15 more have been wounded after a roadside bomb hit a bus carrying university staff in Afghanistan.
Professors from Al-Biruni university were travelling through Charikar, the capital of Parwan province, about 70km north of capital Kabul.
No group has claimed responsibility.
Afghanistan has seen increasing violence in recent weeks as the US and Nato prepare to withdraw all troops.
The deadline for the withdrawal is 11 September – 20 years to the day since the attack on the World Trade Center in New York. In the months which followed, the US and its allies invaded Afghanistan, forcing the Taliban from power and beginning an almost two-decade long war.
Saturday’s blast happened at around 3:15pm local time. A spokesman for the ministry of higher education said some of the wounded teachers are in a critical condition. The university’s chancellor was also reportedly injured in the attack.
The attack comes just weeks after blasts close to a secondary school in Kabul killed at least 60 people and injured more than 100.
Students were killed as they left their classrooms. Most of the victims were girls.
On Tuesday Australia announced it was closing its embassy in Afghanistan due to the “increasingly uncertain security environment” in the country.
US and Nato officials have recently said that the Taliban has so far failed to live up to commitments to reduce violence in Afghanistan. The group has denied the allegation.