The relative calm of a ceasefire between Israel and Hamas has come to an abrupt end with Israel launching dozens of attacks on targets across the Gaza Strip.

Israel said the Tuesday attacks were launched after Hamas refused to release more hostages held in Gaza. The strikes raise the prospect of a full resumption of war after a nearly two-month ceasefire.

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Prime Minister Benjamin Netanyahu’s office said he had ordered the aerial attacks after Hamas’s “repeated refusal” to release the remaining hostages it holds. “This is just the beginning,” he said.

Israel ended the Hamas ceasefire with deadly airstrikes across Gaza, days after the US ordered an offensive against the Houthis in an escalation of hostilities against Iran-backed militant groups. Prime Minister Benjamin Netanyahu vowed Tuesday to act “with increasing military strength” against Hamas,