Experts say the United States, Britain, France and Iran are likely to be involved in war crimes committed by the warring parties in Yemen.
A new report by the United Nations warns that countries could be arrested for aiding war criminals.
Western leaders support a coalition of Saudi-led forces, while Iran supports the Houthi rebels.
Experts say the two sides continue to commit war crimes without any fear.
The report by the experts collects information on the crimes committed by the parties in the crisis which is the worst in the world.
The report said the crimes include attacks on civilian aircraft, frequent shootings of mothers, wolves, torture, rape and rape at correctional institutions and obstruction of humanitarian aid. to the people.
The four-year Yemeni conflict has left 7,290 civilians dead and 24 million people - 80 per cent of the country's population - in desperate need of special supplies, including 10 million. desperate for food.
The delegation, which includes experts in Yemen's crisis, has spoken 600 times with eyewitnesses and victims.
They then analyze some evidence gathered from the public and their reports that are publicly available, in part two of the United Nations Human Rights Commission report.
Experts say they have ample evidence that the Yemeni government and the Saudi-led coalition and the Houthi rebel group violate laws and violate civil rights without being punished.
The expert team also investigated air strikes in Houthi rebel-held areas, killing civilians.
Experts say the attacks have raised concerns about the motives of government troops and the observance of laws and due diligence during attacks.
The report says that if the allegations of a terrorist attack are unclear, it could be a serious crime and a violation of international law.
It is alleged that both parties have used interdependence as a strategy for war.
Experts called for an immediate halt to all forms of violence against civilians and called on other nations to stop providing arms to the warring parties in the Yemen crisis.
Since 2015, Taiz, the third largest city in Yemen, has been occupied.
Experts emphasize: "Governments must take all reasonable steps to ensure that other countries comply with international human rights standards.
"The arms trade agreement signed by France and Britain in the countries it signed prohibits the issuance of arms to those known to use the weapons in war crimes."
"There is still a question as to the legality of the arms embargo by France, Britain and the United States, and local courts should investigate," the expert said.
One journalist who wrote the report, Melissa Parke, an Australian, told reporters in Geneva:
"It is clear that continuing to provide arms to the warring parties continues to prolong the crisis and the suffering of the Yemeni people."
Experts have also compiled a list of some of the most notorious criminals around the world, and have then secretly submitted their names to the International Human Rights Commission.
Saudi-led coalition forces and the Yemeni government and Houthi rebels have not commented on the report.
But in the past, they have all denied war crimes.
A spokesman for the British government said: "Britain is at the forefront of international efforts to find a diplomatic solution to the tragic Yemen crisis.
"Our government is one of the most successful trading and foreign countries in the world."
In the past, British ministers said they could not say whether British bombers or planes were responsible for the deaths of civilians in Yemen, although the Joint Task Force did not monitor their use.
The United States has opposed a ban on the sale or distribution of weapons in the Yemen crisis, saying the development of the weapons could reduce the number of civilian casualties.
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