KARACHI, Pakistan (AFP) — Gunmen attacked the Pakistan Stock Exchange in Karachi Monday, with four of the assailants killed, police said. Karachi police chief Ghulam Nabi Memon said the attackers pulled up in a car outside the trading floor and hurled a grenade at the building before opening fire. “Four attackers have been killed,” he added. Karachi was once a hotspot for crime and political and ethnic violence, with heavily armed groups tied to politicians […]