Saudi officials say a suicide bomber has killed two border guards and wounded a third in an attack near the Iraqi border.
The Interior Ministry said the attack early Monday in Arar began with the bomber and another "terrorist" shooting at a border patrol. The guards returned fire, killing one person. The bomber detonated his explosives.
There was no immediate claim of responsibility.
Saudi Arabia has been taking part in the U.S.-led coalition carrying out airstrikes against the Islamic State group in Syria.
Since late September, U.S. and Saudi forces, along with those from Jordan, Bahrain and the United Arab Emirates, have conducted more than 600 airstrikes targeting the militants who took over large areas in Syria and Iraq.