The Palestinian Authority have given the bullet that killed Al Jazeera journalist Shireen Abu Akleh to US forensic experts as it seeks to prove conclusively that it was fired by an Israel soldier.

The Palestinian Authority was assured that no modifications would be made to the bullet that killed Ms Abu Akleh during an Israeli raid in the occupied West Bank.

Palestinian Attorney General Akram Al-Khatib said they were told that it would be returned as soon as the assessment was complete.

The Palestinian Authority gave the green light to hand over the bullet to the US, but not to Israel, the Palestinians' official Wafa news agency reported.

The Palestinian-American journalist, who was wearing a vest marked "Press" and a helmet, was killed on 11 May while covering an Israeli army operation in Jenin camp in the northern West Bank.

The official Palestinian investigation found that the Qatar-based television channel's star reporter was killed after being hit by a bullet just below her helmet.

It found that Ms Abu Akleh was killed with a 5.56mm armour-piercing round fired from a Ruger Mini-14 rifle.

US Secretary of State Antony Blinken had promised last month to pursue accountability over the killing wherever the facts might lead.

"We are looking for an independent, credible investigation. When that investigation happens, we will follow the facts, wherever they lead. It's as straightforward as that," said Mr Blinken.

Israel rejects blame

Investigations by the UN, as well as several journalistic probes, have found that the shot that killed Ms Abu Akleh was fired by Israeli forces.

"We find that the shots that killed Abu Akleh came from Israeli security forces," UN Human Rights Office spokeswoman Ravina Shamdasani told reporters in Geneva.

"It is deeply disturbing that Israeli authorities have not conducted a criminal investigation," she said.

The UN rights office inspected photo, video and audio material, visited the scene, consulted experts, reviewed official communications and interviewed witnesses.

The probe examined submissions from the Israeli army and the Palestinian Attorney general.

Israel will conduct a ballistics test on the bullet that Ms Abu Akleh, the country's army has said. Army spokesman Ran Kochav's comment on army radio.

A Palestinian official, who requested anonymity, told AFP the Israeli comment raised questions about whether the Palestinian Authority could "trust the Americans".

Speaking to army radio, Mr Kochav said: "The test won't be American, the test will be an Israeli test with an American presence.

"We are waiting for the results, if we killed her, we'll take responsibility for it, and will be sorry for it. We are also sorry when people that are not involved are killed by Palestinian gunmen," he also said.

Israel's army was not immediately available to provide further explanation of Mr Kochav's remarks, including whether an Israeli ballistics test was already under way.

Palestinian sources in Ramallah have said they expected the test to be conducted at the US embassy in Jerusalem.