'Do everything...': Angry China wants Pak to punish Karachi blast perpetrators

A female suicide bomber killed three Chinese teachers and a Pakistani national in Karachi on Tuesday. This was the first major attack this year against nationals of long-time ally China working in Pakistan. The three were among passengers on a minibus returning to Karachi university after a lunch break when the bomb exploded at the entrance to the university's Confucius Institute. China in a strongly worded statement has condemned the attack and demanded Pakistan to severely punish culprits behind the Karachi attack. Watch this report for more.