Ms Abu Akleh, 51, was reporting on an Israeli raid in the city of Jenin on Wednesday when she was shot in the head whilst wearing a press vest.

Tear gas was fired outside the hospital where her body was being held in east Jerusalem, and a shrine destroyed.

An hour later, Israeli police arrested mourners chanting outside the Catholic church in Jerusalem's old city.

Shortly before the funeral started, the IDF released preliminary findings from their investigation into the killing.

The report says it is still not possible to determine who fired the bullet that killed the journalist, but they concede it could have been an IDF soldier.

The findings will make little difference to the thousands gathered in Jerusalem to bury her - to Palestinians she was murdered and they have lost a voice that spent decades reporting on events in the West Bank

The situation remains very tense.

On Thursday, thousands of people gathered for a memorial service while her body was carried through the streets - with the bulletproof vest on top of the coffin.

At one point Israeli police even attacked the pall bearers, causing the coffin to slip.

Reporters who were with Ms Abu Akleh, including one who was shot and wounded, said there were no clashes or militants in the immediate area when she was killed early on Wednesday.

All of them wore protective equipment that clearly identified them as reporters.

Israel has called for a joint investigation with the Palestinian Authority (PA) and for it to hand over the bullet for forensic analysis to determine who fired the fatal round.

The PA has refused, saying it will conduct its own investigation and send the results to the International Criminal Court, which is already investigating possible Israeli war crimes.

Ms Abu Akleh was a Palestinian-American reporter who covered the Middle East conflict for more than 25 years.

She joined Al Jazeera's Arabic-language service in 1997 and rose to prominence covering the second Palestinian intifada, or uprising against Israeli rule, in the early 2000s.

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Recent days have seen an outpouring of grief from across the Palestinian territories and the wider Arab world.

Qatar-based Al Jazeera had earlier said that its managing director, Ahmad Alyafei, would travel to Jerusalem to attend the funeral.