People standing on a rooftop watch as a ball of fire and smoke rises above a building in Gaza City on October 7, 2023 during an Israeli air strike. At least 70 people were reported killed in Israel, while Gaza authorities released a death toll of 198 in the bloodiest escalation in the wider conflict since May 2021, with hundreds more wounded on both sides.
President Joe Biden said US support for Israel was "rock solid and unwavering."
The UN's human rights chief Volker Turk calls for an immediate stop to the violence.
Countries around the world have condemned a wave of Palestinian attacks by land, sea and air that Israel's army says left more than 200 dead.
Some countries also called for a de-escalation of the conflict, after Israel launched air strikes and other military operations targeting Gaza that Palestinian authorities say killed more than 230 people.