The United States, Britain and France may be complicit in war crimes in Yemen by arming and providing intelligence and logistics support to a Saudi-led coalition that starves civilians as a war tactic, a damning United Nations report said on Tuesday.

U.N. investigators compiled a secret list of possible international war crimes suspects, drawn from their latest report into violations during the four-year conflict between Arab states and the Houthi movement that controls Yemen's capital.

Investigators found potential crimes on both sides, while also highlighting the role Western countries play as key backers of the Arab states and Iran plays in support of the Houthis.

The United States, Britain and France may be complicit in war crimes in Yemen by arming and providing intelligence and logistics support to a Saudi-led coalition that starves civilians as a war tactic, a damning United Nations report said on Tuesday

Britain is among the Western countries to have supported Saudi Arabia in selling arms to them

The report accused the anti-Houthi coalition led by Saudi Arabia and the United Arab Emirates of killing civilians in air strikes and deliberately denying them food in a country facing famine.

The Houthis for their part have shelled cities, deployed child soldiers and used 'siege-like warfare' tactics, it said.

The Houthis drove Yemen's government out of the capital Sanaa in 2014. The Saudi-led coalition of Sunni Muslim states intervened the following year to restore the ousted government, a conflict that has since killed tens of thousands of people.

The prospect of famine has created what the United Nations describes as the world's biggest humanitarian crisis.

The U.N. report said its independent panel had sent a secret list to U.N. human rights chief Michelle Bachelet, identifying 'individuals who may be responsible for international crimes'.

People inspect the site of Saudi-led air strikes on a Houthi detention centre in Dhamar, Yemen

France's President Emmanuel Macron, who's country is also among the Western countries supporting the Saudi-led coalition by selling weapons to them

Its appendix lists the names of more than 160 'main actors' among Saudi, Emirati and Yemeni top brass as well as the Houthi movement, although it did not specify whether any of these names also figured in its list of potential suspects.

'Individuals in the Government of Yemen and the coalition, including Saudi Arabia and the United Arab Emirates, may have conducted airstrikes in violation of the principles of distinction, proportionality and precaution, and may have used starvation as a method of warfare, acts that may amount to war crimes,' it said.

'The legality of arms transfers by France, the United Kingdom, the United States and other States remains questionable, and is the subject of various domestic court proceedings.'

Investigators found potential crimes on both sides, while also highlighting the role Western countries play as key backers of the Arab states and Iran (whose president Hassan Rouhani is pictured) plays in support of the Houthis

It found that a Joint Incidents Assessment Team set up by Saudi Arabia to review alleged coalition violations had failed to hold anyone accountable for any strike killing civilians, raising 'concerns as to the impartiality of its investigations'.

The U.N. panel said it had received allegations that Emirati and affiliated forces have tortured, raped and killed suspected political opponents detained in secret facilities, while Houthi forces had planted land mines.

Air strikes by the Saudi-led military coalition in southwest Yemen hit a prison complex, killing scores of people, the Houthi movement and a Red Cross official said on Sunday.