Police say gunmen on a motorcycle have killed a Shiite Muslim university director and his driver in eastern Pakistan in a possible sectarian attack.

Police officer Nazir Asif Rizvi says Shabbir Shah and his driver were killed in the city of Gujrat on Tuesday as he was heading to work at the University of Gujrat. He said they are still investigating the incident.

Sectarian violence between Sunni and Shiite Muslims has flared in northern Pakistan in recent days.

Ten people were killed when the two sects clashed in Rawalpindi city Friday. Three more people were killed Monday in Kohat city.

Authorities responded by deploying troops and imposing curfews in the affected areas. A Taliban spokesman has vowed to avenge Sunnis killed in the clashes.