Karachi, Feb 16 Eight Heavily-armed Pakistani Taliban militants on Friday stormed the Karachi Police chief's office in the country's most populous city, sparking gunfire that killed two rebels and two others, the latest brazen assault on security forces amid an uptick in terror attacks across the country. The attack took place around 7:10 pm local time. A spokesperson of the Karachi Police confirmed in a statement that the Karachi police chief’s head office had come under attack.