Islamabad, Pakistan (CNN) -- An explosion Monday near a school bus in the northwestern Pakistani city of Peshawar killed the bus driver and injured two children, police said.
Two suspects were detained at the blast site, said Ejaz Khan, a senior police official in Peshawar.
Authorities do not believe the bus was the target of the bomb, which was planted in the road, said Salim Khan, another senior police official in Peshawar.
The explosion occurred in the area of Bhana Marri, Khan said.
CNN affiliate GEO TV showed images of a charred, windowless bus.
CNN's Samson Desta and journalist Nasir Habib contributed to this report.