DUBAI- Yemen's Houthi movement attacked a Saudi oil tanker in the Red Sea, causing slight damage, the Western-backed Arab coalition said on Wednesday, after the Houthis reported targeting a Saudi warship in the area.

Saudi Arabia and Sunni Muslim allies have been fighting in Yemen for three years against the Iran-aligned Houthis, who control much of North Yemen including the capital Sanaa and drove a Saudi-backed government into exile in 2014.

The Saudi-led coalition says one of the main justifications for its intervention is to protect shipping routes such as the Red Sea, which is used to bring Middle Eastern oil and Asian goods to Europe through the Suez Canal. It has said that it foiled previous attacks in the Red Sea in April and May.

"The Saudi oil tanker was subjected to slight damage due to the attack by the Houthi militia," said a statement carried by Saudi state media. It did not name the vessel or describe the method of attack.

Saudi Aramco referred a Reuters' query about the incident to the relevant government ministry.

The Houthis' Al Masirah TV said earlier on Twitter that it had targeted a warship named the Dammam off the western coast of Yemen, without providing details.

The Houthis have also fired missiles into Saudi Arabia. The coalition has carried out a campaign of thousands of air strikes and reestricted imports into Yemen, worsening what the United Nations says is potentially the world's worst humanitarian crisis.

Saudi Arabia accuses arch-regional foe Iran of supplying missiles to the Houthis, something Tehran and the Houthis deny.

(Reporting by Omar Fahmy, Marwa Rashad and Ghaida Ghantous, Writing by Stephen Kalin; editing by Mark Heinrich) ((mailto:marwa.rashad@thomsonreuters.com; +966114632603 ; Reuters Messaging: rm://marwa.rashad.thomsonreuters.com@reuters.net))