A bomb blast Tuesday wounded four people, including two policemen, in the northwestern Pakistani city of Peshawar, police said.
The bomb planted on a roadside struck a police patrol van at Peshawar's Ring Road area injuring two policemen and two pedestrians, police official Khan Abbas told AFP.
"The injured were rushed to hospital and their injuries were not serious," Khan said.
Peshawar is close to Pakistan's semi-autonomous tribal zones, which border Afghanistan and where government forces have been battling pro-Taliban and Al-Qaeda-linked militants.
A wave of attacks have claimed more than 1,500 lives in the past 17 months.