Two Israeli air strikes on buildings in Gaza City have killed at least 42 people and injured many more, Hamas says.
The Israeli military said warplanes had struck two Hamas military infrastructure sites and it would provide more details later.
A spokesman for Gaza's civil defence said a residential block in the al-Shati area, one of Gaza's historic refugee camps, was hit several times.
Footage showed people carrying away the wounded and searching for survivors in the wreckage as dust filled the streets.
The Hamas-run Government Media Office in Gaza said the strike on al-Shati killed 24 people and the strike on the al-Tuffah area of Gaza City killed 18 people.
Israel launched a campaign to destroy Hamas in response to an unprecedented attack on southern Israel on 7 October, during which about 1,200 people - mostly civilians - were killed and 251 others were taken hostage.
More than 37,551 people have been killed in Gaza since then, according to the territory's Hamas-run health ministry.
Its figures do not differentiate between civilians and combatants, but it had reportedly identified 14,680 children, women and elderly people among the dead by the end of April.
