KARACHI: Police killed four gunmen involved in an attack in the Pakistani Stock Exchange building in Karachi today.

The gunmen attacked the building that houses the head offices of many private banks, with guns and grenades, Karachi police chief Ghulam Nabi Memon said.

The attackers had come in a silver Corolla car, police said.

No group has claimed responsibility for the attack.

The gunmen threw a grenade and then opened fire on a security post outside the building, reports said.

(With inputs from Agencies)