The United States and Britain condemned as "unacceptable" drone attacks on Saudi oil facilities on Saturday.
"The US strongly condemns today's drone attacks against oil facilities in Abqaiq and Khurais," the US mission in Riyadh quoted Ambassador John Abizaid as saying.
"These attacks against critical infrastructure endanger civilians, are unacceptable, and sooner or later will result in innocent lives being lost,” Abizaid added.
Drone attacks on two Saudi Aramco facilities in Abqaiq and Khurais on Saturday caused fires that the company's security team brought under control.
"Totally unacceptable attack on oil facilities in Saudi Arabia this morning," Andrew Murrison, the British foreign affairs minister responsible for the Middle East and North Africa said on Twitter.