Four gunmen attempted to storm the Pakistan Stock Exchange building but were killed by security forces, police have said.
The military said two other people were also dead following the attack on the building in Karachi, which houses the Pakistan State Bank and several national and international financial institutions.
Rizwan Ahmend, a police official at the scene, said that after opening fire, the gunmen entered the high walled stock exchange grounds.
They were reportedly armed with grenades and automatic rifles.
Mr Ahmend said food supplies were found on the bodies of the gunmen, indicating they may have planned a long siege, which police quickly thwarted.
Security forces were conducting a sweep for any remaining attackers, the military said.
“Four attackers have been killed, they had come in a silver Corolla car,” said Ghulam Nabi Memon, chief of police in Karachi, Pakistan’s biggest city and its financial hub.
The gunmen initially threw a grenade at security men posted outside the stock exchange compound then opened fire on a security post, according to Reuters. The four were killed when security forces posted there responded.
Inside the stock exchange, broker Yaqub Memon said he and others were huddled inside their offices. There were no reports of any wounded among the brokers and employees inside the exchange.