Biden expects 'significant de-escalation today' in Israel

"The president conveyed to the prime minister that he expected a significant de-escalation today on the path to a ceasefire," according to a statement released after what the White House said was the two leaders' fourth call since the crisis began.

The statement marked a sharpening of public tone from the White House toward the close US ally.

However, there was no mention of how Biden defined "significant" in his call to tune down the bombing of Gaza, which Israel says is directed at the Hamas group.

White House spokeswoman Karine Jean-Pierre also would not say what response there would be if no change occurred on Wednesday.

US Defence Secretary Lloyd Austin similarly took a stronger stance during a call with his Israeli counterpart Benjamin Gantz.

During the conversation Austin "reviewed assessments of Israel's military campaign in Gaza, and urged de-escalation of the conflict," according to a Pentagon readout, which also stated that he "underscored his continued support for Israel's right to defend itself."

According to Gaza officials, at least 213 people, including 61 children, have been killed by Israeli attacks on the crowded territory since May 10. Twelve people have been killed in Israel by Hamas rockets.

So far, Biden has avoided joining an international chorus demanding an immediate ceasefire in Israel, saying only that he supports a truce. Israel is one of the United States' closest allies, and Biden has been at pains to express backing for Netanyahu's argument that the country's powerful military is acting in self-defence.

Biden has come under pressure from much of his own Democratic party to adopt a tougher line. The White House says that it does not want to create a public rift with Israel but suggests that it has taken a more critical approach in private conversations.