At least 15 Palestinians, most of them children, were killed in two separate Israeli strikes overnight in Gaza City, a hospital there said Monday.

One strike killed 12 people from an extended family in the Zeitoun neighborhood, the Shifa hospital said.

Among them were a mother and her children.

During the funeral service of the dead, a man, whose wife and their three children were killed in the strike, lashed out at Hamas.

He accused the militant group of causing the killing of the children through triggering the Gaza war.

"Hamas, you've killed our children” the man was heard saying in a video obtained by Associated Press. "What is their fault?” he said.

While crying and screaming in front of the bodies of the children, he fainted and a group of people attempted to help him, the footage showed.

Another strike hit a tent sheltering a displaced family and killed two parents and their child, the hospital also said.

Hamas-led militants killed some 1,200 people, mostly civilians, and abducted 251 others in the 2023 attack on Israel.

More than half of the hostages have been released in ceasefires or other deals.

Israel's offensive has killed around 61,500 Palestinians, according to Gaza's Health Ministry.

The ministry, which is part of the Hamas-run government and run by medical professionals, does not say how many of those killed were civilians or combatants, but it says women and children make up around half of the fatalities.

The agency's numbers are considered a reliable estimate by the U.N. and independent experts. Israel disputes them but has not offered its own figures.