ISLAMABAD, April 7 (Xinhua) -- A policeman was killed and another injured when a bomb went off in Pakistan's northwest Khyber Pakhtunkhwa province on Saturday, rescue officials said.

The incident happened in the tribal district of Bajaur where the police party was targeted by a roadside improvised explosive device, Saad Khan, media coordinator of the state-owned Rescue organization 1122 in Bajaur, told Xinhua.

The injured policeman was shifted to a nearby hospital.

No group has claimed responsibility for the attack. The blast site was cordoned off for investigations.