The UN agency for Palestinian refugees says six of its employees have been killed in an Israeli air strike on one of the schools it runs in central Gaza.
Unrwa said it was "the highest death toll among our staff in a single incident" since the start of the war between Israel and Hamas in October.
Hospital officials and the Hamas-run Civil Defence agency said earlier that at least 14 people had been killed in the strike on al-Jaouni school in Nuseirat refugee camp, which is being used as a shelter by thousands of displaced Palestinians.
Israel's military says it carried out a “precise strike on terrorists” planning attacks from inside the school, adding that it had taken measures to mitigate harm to civilians.
Unrwa said it was the fifth time the school had been hit over the past 11 months.
In July, 16 people were reportedly killed in a strike which the Israeli military said had targeted several structures at the school used by Hamas fighters.