Security tightened in Pakistan after twin bomb attack (3)

A Pakistani flag flies at half mast on Balochistan provisional assembly to honor victims of terror attacks in southwest Pakistan's Quetta, June 16, 2013. A day of mourning was observed across Pakistan's southwestern Balochistan province on Sunday over Saturday's bombings targeting the Women University bus and the Bolan Medical Complex which has claimed 20 precious lives. (Xinhua/Mohammad)