The attack on Tuesday night caused a fire and damaged one side of the four-story structure that was allegedly housing displaced persons in the seaside town of Barja, which is primarily Sunni Muslim.
According to the Israeli military, it targeted “terror infrastructure” that belonged to Hezbollah, a Shia armed organization.
Israeli bombings around the eastern city of Baalbek killed another 30 people Wednesday, the local governor said.
The Lebanese health ministry reported a preliminary death toll of 20 from the hit on Barja late Tuesday, but there was no instant confirmation.
Living on one of the top floors of the damaged apartment building, Moussa Zahran reported that falling masonry had hurt his wife and son.