An Israeli source has confirmed to ITV News that Israel fired a single mortar round into the playground at a UN-run school in Gaza three days ago.

Sixteen people were killed and more than 200 injured at the school in Beit Hanoun on Thursday where hundreds of Palestinians were taking shelter.

However the Israeli source said drone footage that has yet to be released shows the playground was empty at the time the "errant" mortar was fired.

ITV News Correspondent Dan Rivers reports from the site, which is still seen as too dangerous by the UN to investigate the cause of the deaths: