The vendor who supplies the hospital with medical oxygen to refill tanks failed to arrive in time to save the patients, officials said.
The attack happened as a prominent religious scholar was delivering a lecture about the teachings of Islam.
"I don’t want to go back to Afghanistan to get butchered."
The attacks occurred hours after militants killed two people in a Christian neighborhood in the same region.
Pakistani civil and military leaders, as well as the society, must realize what is bad for Kabul and Delhi is bad for Lahore, too. The Pakistan state policy of using jihadist terror to wage proxy wars is backfiring, as the Lahore bombing on Easter Sunday has tragically demonstrated.
The Pakistani army said four attackers were killed.