President Joe Biden warned Israel of a sharp shift in his policy over the Gaza war Thursday amid growing frustration with Benjamin Netanyahu and mounting domestic pressure in a US election year, reports BSS.

A tense phone call between the two leaders appeared to yield at least some results, as Netanyahu's office announced within hours it would temporarily allow more aid to flow into Gaza.

But the Democrat faces spiraling anger from Muslim and younger voters over his support for Israel, and political allies have been pressing him to make the aid conditional on changed Israeli behavior.

In a 30-minute call with Netanyahu after Israeli strikes killed seven aid workers from US-based charity World Central Kitchen, Biden hinted at doing just that.

For the first time, Biden "made clear that US policy with respect to Gaza will be determined by our assessment of Israel's immediate action" to curtail the killing of civilians and aid workers and improve the dire humanitarian situation, the White House said.

The tough language, describing the aid worker attack as "unacceptable" and urging Israel to take steps towards an immediate ceasefire, reflected mounting tensions with Netanyahu.

"What happened to the World Central Kitchen, that event certainly was a catalyst for the call today," White House National Security Council spokesman John Kirby told CNN Thursday evening.

Earlier this week the WCK convoy was repeatedly struck by Israeli forces despite clearing its route with the military. A US-Canadian dual national was among those killed in the attack, which Israel has called a mistake.

Biden's "frustration has been growing over recent weeks and months over the dangers to the civilian population in Gaza and to aid workers," Kirby said.

Later that evening Netanyahu's office announced it was reopening the Erez border crossing for the first time since October 7 to allow aid into the northern Gaza Strip, as well as allowing supplies to pass through the port of Ashdod. Increased levels of Jordanian aid will go through Kerem Shalom.

The White House said the steps were taken "at the president's request" and "must now be fully and rapidly implemented."

Bd-pratidin English/Tanvir Raihan