Gunmen on Monday night attacked the Jinnah hospital in this eastern Pakistani city, killing at least 12 people, including four policemen, and injuring several others, media reports said.
The attack was reportedly a bid to free a terrorist, Amir Muavia, captured in an injured condition during an attack on a mosque in the city last week.
About three to four gunmen stormed into the emergency ward of the hospital where several injured people of Friday's mosque attacks were admitted, Xinhua reported.
Superintendent (Investigation) Abdul Rab told PTI that the attackers entered the hospital from the rooftop. They then made their way to the intensive care unit on the first floor where the injured terrorist was being treated.
After shooting at some policemen deployed on the first floor, they tried to storm the Intensive Care Unit (ICU), Rab said.
However, other policemen retaliated. The attackers then fled from the hospital in a police van.
The attackers held patients and hospital staff hostage to thwart the police who arrived at the scene. They later escaped after a brief exchange of fire with security forces.
Geo TV said attendants of the hospital are among the dead.
The attack comes four days after Taliban guerrillas killed at least 62 people at two mosques of the minority Ahmadi sect in Garhi Shahu and Model Town areas of Lahore. Many people were also injured in the attacks.
(With IANS and PTI inputs)