Gaza's civil defence agency on Sunday said 30 people, including 13 children, were killed in Israeli strikes on two houses in the north of the Palestinian territory.
The first strike early Sunday hit a house in Jabalia, northern Gaza, killing "at least 25" people, including 13 children, and injuring more than 30, the civil defence said.
Another strike on the Sabra neighbourhood of Gaza City killed five people, with others still missing in the aftermath.
"A number of civilians are still under the rubble," the civil denfece added.
Since 6 October, the Israeli military has been engaged in an intensified air and ground assault on areas of northern Gaza, including Jabalia, where hundreds have been killed since.
At least 23 people were killed including seven children in the village of Almat, north of the capital Beirut. The targeted victims were reportedly members of the Arsifeh family, displaced from Baalbek, L'Orient Today said.
Also on Sunday, an Israeli strike targeted a residential building in the Sayeda Zainab district south of the Syrian capital Damascus, the Syrian state news agency said.
Seven people were killed and 14 were wounded, including women and children, Rami Abdel Rahman, who heads the Syrian Observatory for Human Rights, told AFP.