US deploying ships closer to Israel, sends munitions

President Joe Biden ordered US ships and warplanes to move closer to Israel in a show of support on Sunday, while sending fresh military aid in the wake of attacks by the Palestinian militant group Hamas and Israel's bombing of Gaza in response.

The Pentagon said it was sending the aircraft carrier USS Gerald R. Ford and its accompanying warships to the eastern Mediterranean, while boosting fighter aircraft squadrons in the region.

The United States, a major supplier of arms to Israel, has moved quickly to affirm its backing for Israel after Saturday's surprise attack from the Gaza Strip, vowing "rock solid" support and warning other parties to stay out of the conflict.

Biden spoke to Israeli Prime Minister Benjamin Netanyahu and "conveyed that additional assistance" for the Israeli army "is now on its way to Israel with more to follow over the coming days," the White House said.

"The leaders also discussed ongoing efforts to ensure that no enemies of Israel believe they can or should seek advantage from the current situation," it said in a statement.

The US president further "pledged his full support for the Government and people of Israel in the face of an unprecedented and appalling assault by Hamas terrorists."

The Israeli-Palestinian conflict's worst escalation in decades has claimed more than 600 lives on the Israeli side, the government press office said, while the Palestinian Health Ministry reports 413 deaths, including 78 children, in Israeli airstrikes. Thousands of others have been wounded.

Israel's Netanyahu has steeled his electorate for what he called a long war ahead, with tens of thousands of Israeli forces already deployed to battle holdout Hamas forces and prepare a possible Gaza ground offensive.

The conflict has also stoked fears of a wider conflagration. Lebanon's Iran-backed Hezbollah movement said Sunday it had fired shells and missiles at Israeli positions. 

With tensions rising, US Defense Secretary Lloyd Austin said he was sending forces to "bolster regional deterrence efforts" after discussions with Biden.

As well as the USS Gerald R. Ford carrier, this deployment includes a guided missile cruiser and four guided missile destroyers, Austin said in a statement.

"The United States government will be rapidly providing the Israel … [army] with additional equipment and resources, including munitions," Austin added.

US Secretary of State Antony Blinken said earlier that Biden ordered his administration to give Israel "everything it needs in this moment to deal with the attacks from Hamas."

A number of Americans may also have been take hostage, Blinken said.

"We have reports that several Americans were killed. We're working overtime to verify that. At the same time, there are reports of missing Americans and there again, we're working to verify those reports," Blinken said.