UPDATE 2-Yemen's Houthis say missile fired at Saudi Arabia's Najran region

Yemen's Houthi rebels fired a ballistic missile just over the border into Saudi Arabia, causing no apparent casualties, amid growing international concern about civilian casualties from a Saudi-led air campaign.

A Badr-1 missile targeted "a new military camp" in Najran, Houthi-controlled al-Masirah TV said on Wednesday, without indicating when the missile was launched. Saudi air defenses intercepted a missile fired towards the southern city of Najran on Tuesday but there were no casualties.

Saudi Arabia is leading a Western-backed alliance of Sunni Muslim Arab states trying to restore the internationally recognized government of Yemeni President Abd-Rabbu Mansour Hadi, ousted from the capital Sanaa by the Houthis in 2015.

The Iran-aligned Houthis control most of the west of Yemen, including its Red Sea coast.

U.N. human rights experts said in a report on Tuesday that both the Saudi-led coalition and the Houthi militia may be guilty of war crimes in the conflict, which has raged for more than three years.

The experts' panel said air strikes by the coalition in Yemen have caused heavy civilian casualties, raising concerns about its targeting process.

The panel also accused Houthi fighters of restricting access on humanitarian aid and conscripting child soldiers. The Houthis regularly fire missiles on southern Saudi Arabia and occasionally aim for higher-value targets, such as the capital Riyadh or facilities of state oil company Aramco.

The experts said they did not examine the United States and Britain, who supply weapons and intelligence to the alliance, or Iranian support for the Houthis, but other U.N. bodies were doing so. They urged all states to restrict arms sales to help end the war.

A New York Times editorial on Wednesday condemned what it called "American complicity" in civilian casualties -- including dozens of children killed earlier this month in an air strike on a bus -- and urged Congress to cut military aid to Saudi Arabia.

"Saudi Arabia and its allies seem to have little compunction about slaughtering children as long as more bombs can be bought, so it's up to the enablers to call a halt," it said.

In Washington on Tuesday, U.S. Secretary of Defense Jim Mattis said U.S. support for the Saudi-led coalition was not unconditional, but suggested the United States would continue to support the alliance as it worked to reduce the impact on civilians.

Amnesty International called on Washington, London and others to "do everything in their power to prevent further violations (including) immediately stopping the flow of arms to the country and end the Coalition's arbitrary restrictions on humanitarian assistance and essential imports." Britain is also a major arms supplier to Saudi Arabia.

The United Nations has convened talks in Geneva on Sept 6, the first effort to negotiate the war in more than two years.

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