ISLAMABAD, Sept. 22 (Xinhua) -- A policeman was killed and three others were injured in a blast at a police vehicle in Pakistan's northwest Khyber Pakhtunkhwa province on Sunday, said police.
The incident happened in the Swat district where the vehicle was targeted by a roadside planted device, sources from Swat police told Xinhua.
Four policemen were injured in the attack and one of them succumbed to injuries later at a hospital where all of them were shifted after the attack, the sources added.
No group has claimed responsibility for the attack yet.
Police cordoned off the area for further investigations. ■