Israel launched a deadly attack on a UN school housing refugees in Gaza despite repeated warnings that civilians were sheltering there, the UN has said.
UN spokesman Chris Gunness said "the world stands disgraced" by the attack, in which 15 were reported killed.
Israel, which has accused the militant group Hamas of using schools as bases to launch rockets, has not yet commented on the claims.
Some 1,200 Palestinians and 55 Israelis have been killed in the conflict.
Most of the Palestinian deaths have been civilians.