Israel will use “enormous force” against the Hamas militant group, Prime Minister Benjamin Netanyahu has warned.
He says the Israel Defense Forces’ retaliation for the worst attack on Israeli soil in decades has only just begun.
More than 700 people have been killed in Israel since Saturday’s surprise attack, including 260 people massacred by Hamas gunmen at a music festival.
Since Israel began striking Gaza in response, nearly 600 people have died.
Israel’s defence minister earlier ordered a “complete siege” of the Gaza Strip, cutting off food, fuel, electricity and water supplies.
Nine US citizens are now confirmed dead in Israel, while more than 10 British citizens are feared dead, or missing.