Pakistani policemen stand guard on road due to security high alert in northwest Pakistan's Peshawar, on Feb. 3, 2013. At least 22 people were killed and a dozen others injured when a security camp was attacked in Pakistan's northwest district of Lakki Marwat area on Saturday morning, local media reported. (Xinhua/Ahmad Sidique) 

A Pakistani policeman stands guard on road due to security high alert in northwest Pakistan's Peshawar, on Feb. 3, 2013. At least 22 people were killed and a dozen others injured when a security camp was attacked in Pakistan's northwest district of Lakki Marwat area on Saturday morning, local media reported. (Xinhua/Ahmad Sidique)