Watch: Taliban bomber blew up Pak police building in Karachi with explosive vest

More footage of the terror attack on police chief HQ in Karachi has emerged. New footage shows the moment when a suicide bomber detonated his vest inside a building. As per Pakistan police, all three terrorists were wearing suicide vests. Pak media reported that each suicide bomber's vest carried 8 kg explosives. However, only one of them detonated his explosive vest and the rest were gunned down. Watch this video for more.