The U.N. and aid groups say the disappearance and torture of Palestinian medical workers is part of Israel's wider attack on Gaza's health care system.
The unrest came after Israeli security forces arrested some Jewish extremists who carried out several attacks in Kafr Malik, killing three Palestinians.
“Extreme heat is no longer a rare event — it has become the new normal,” said António Guterres, as a heat dome hovered over France, Portugal and Spain to Turkey.
The June 23 attack, the day before the ceasefire between Israel and Iran took hold, hit several prison buildings and prompted concerns from rights groups about inmates' safety.