A Saudi Arabiainfo-icon-led military coalition has carried out attacks in Yemeninfo-icon that "may amount to warinfo-icon crimes," UN sanctions monitors reported to the worldinfo-icon body's Security Council, warning coalition allies including the United Statesinfo-icon, Britaininfo-icon and Franceinfo-icon that they are obligated to respect international humanitarian law.

The annual report by the experts who monitor sanctions and the conflictinfo-icon in Yemen, seen by this news agency on Saturday, investigated 10 coalition air strikes between March and October that killed at least 292 civilians, including some 100 women and children.

"In eight of the 10 investigations, the panel found no evidence that the air strikes had targeted legitimate military objectives," the experts wrote in a 63-page report presented to the Security Council on Friday.

"For all 10 investigations, the panel considers it almost certain that the coalition did not meet international humanitarian law requirements of proportionality and precautions in attack," the report said.

 "The panel considers that some of the attacks may amount to war crimes." The experts said Saudi Arabia is leading a military coalition made up of Bahraininfo-icon, Kuwaitinfo-icon, Qatarinfo-icon, the United Arab Emiratesinfo-icon, Egyptinfo-icon, Jordaninfo-icon, Morocco and Sudaninfo-icon.

Saudi UN Ambassador Abdallah Al-Mouallimi said the accusations in the report were unfounded, that the coalition has been "exercising maximum restraint and rigorous rules of engagement," and that there had been transparent investigations into any incidents.

"In some cases errors were acknowledged and responsibility accepted. Corrective measures including compensation to victims were taken," he said.

The UN experts said USinfo-icon officers were supporting coalition logistical and intelligence activities, while the coalition's chief of joint operations told the experts that officers from France, Malaysiainfo-icon and Britain were also present at the Riyadh headquarters.

"All coalition member states and their allies also have an obligation to take appropriate measures to ensure respect for international humanitarian law by the coalition," the UN experts wrote.

"The panel finds that violations associated with the conduct of the air campaign are sufficiently widespread to reflect either an ineffective targeting process or a broader policy of attrition against civilian infrastructure," the report said.

The UN experts said that although they were unable to travelinfo-icon to Yemen, they have "maintained the highest achievable standard of proof."

A spokesman for the British UN mission declined to comment on a leaked document, but added: "We take reports of alleged violations of international humanitarian law by actors in the conflict very seriously."

A senior US State Department official said: "We urge all sides to take steps to prevent harm to civilians. Ending the conflict in Yemen requires a durable cessation of hostilities and a comprehensive political solution."