A roadside bomb exploded Saturday near a vehicle carrying religious students in the southern city of Karachi (search), killing one person and injuring seven, police said.

It was not immediately clear who targeted the pickup truck, which belonged to Jamia Rashidia, one the main Islamic schools in Pakistan (search), deputy police inspector General Tariq Jamil said.

"Bomb disposal experts, after examining the damaged vehicle, have confirmed that it was a bomb which was probably detonated by remote control," Jamil said.

Jamil identified the dead man as Mohammed Azam, an electrician at the school. The wounded were all students from the seminary.

Police discounted initial accounts that the explosion occurred inside the vehicle.

Karachi, Pakistan's largest city with a population of 14 million, has been the scene of several attacks against foreigners, minority Christians and Shiite Muslims in recent months, mostly blamed on Islamic militants.