Four people were killed in an explosion that targeted a bus carrying lecturers and employees of Alberoni University in Bagram district of Parwan on Saturday afternoon, a health official said.

Qasim Sangin, chief medical officer at Parwan Hospital, said 17 others were wounded in the explosion. 

Taliban has been under increasing pressure by government forces on multiple fronts and has suffered a major setback in different regions over the last few weeks as they have mounted their attacks on Afghanistan's defense and security forces, the Afghan intelligence chief Ahmad Zia Saraj said. 

Saraj said that 1,500 Taliban militants were killed in just one week. The Defense Ministry said Saturday that 210 Taliban fighters were killed in counterattacks by Afghan forces in 18 provinces in the last 24 hours.