The UN human rights chief is calling for an international investigation of human rights violations in Yemen’s war, which has killed thousands.

The UN human rights chief is calling for an international investigation of human rights violations in Yemen’s war, which has killed thousands.

Zeid Raad al-Hussein’s call came as his Geneva office on Thursday released a 22-page report chronicling abuses in the war.

"Civilians in Yemen have suffered unbearably over the years from the effects of a number of simultaneous and overlapping armed conflicts," al-Hussein said in a statement.

"And they continue to suffer, absent any form of accountability and justice, while those responsible for the violations and abuses against them enjoy impunity," he said.

"Such a manifestly protracted unjust situation must no longer be tolerated by the international community," al-Hussein insisted, demanding the creation of "an international, independent investigative body".

The report listed numerous attacks on residential areas, market places, hospitals and schools, pointing out that in several cases investigators were "unable to identify the presence of possible military objectives."

It also condemned targeted killings -- including of at least six journalists -- the use of cluster bombs, landmines, and sniper attacks, and the rampant use of child soldiers.

Yemen has been since March 26, 2015 under brutal aggression by Saudi-led coalition.

Riyadh launched the campaign against Ansarullah revolutionaries (known as Houthis) in a bid to restore power to fugitive ex-president Abd Rabbu Mansour Hadi who is a close ally to Saudi Arabia.

Thousands have been martyred and injured in the aggression, with the vast majority of them are civilians.

Zeid’s office says an estimated 3,799 civilians have been killed since the start of the aggression. The UN and rights groups estimate at least 9,000 people overall have died.