Harrowing video reportedly shows a child running through a burning building in Gaza after it was bombed by Israel, in an overnight attack which left more than 30 people dead, according to rescuers.

The Fahmi al-Jarjawi school in Gaza City, which has been housing displaced Palestinians, was targeted as part of 200 attacks on the devastated enclave in the past 48 hours, Israel's military said.

Pictures and videos of fires tearing through the building and the destruction in the aftermath have since circulated online, with the scenes prompting condemnation from around the world.

Footage showing a little girl running through the building, which Al Jazeera and other outlets claim to have verified, was shared by Israeli national broadcaster Kann News before being deleted. It is not clear if the child in the video escaped the blaze.

Other images from the site, where displaced families had been sheltering, show the badly burned corpses of adults and children.