Saudi Arabia has said the kingdom's massive oil installations are well protected, days after a drone attack claimed by Yemeni rebels on a key oil pipeline.

"We have strong (oil) industry security... everybody is vulnerable to extreme acts of sabotage," Energy Minister Khalid al-Falih told reporters on the sidelines of a meeting of major oil producers.

Yemen's Huthi rebels last week claimed responsibility for a drone attack on the huge east-west pipeline forcing it to temporarily shut down.

Saudi Arabia has also said oil supplies were sufficient and stockpiles were still rising, despite massive output drops from Iran and Venezuela.

"We see that (oil) inventories are rising and supplies are plenty," Mr Falih told reporters at the start of the meeting.

"None of us wants to see the (oil) stocks swell again. We have to be cautious," he said.

Saudi Arabia has called for urgent meetings of the regional Gulf Co-operation Council and the Arab League to discuss escalating tensions in the Gulf.

The Saudi Press Agency said King Salman had invited Gulf leaders and Arab states to two emergency summits in Mecca on 30 May, to discuss recent "aggressions and their consequences" in the region.

Tensions have soared in the Gulf with the US deploying an aircraft carrier and bombers to the region over alleged threats from Iran.

Also, four ships including two Saudi oil tankers were damaged in mysterious sabotage attacks in Fujairah, an emirate located at the crucial entrance to the Gulf.

That incident was followed by the drone strikes by Yemen's Huthi rebels on the pipeline, which provided an alternative export route if the Strait of Hormuz is closed.

Iran has repeatedly threatened to prevent shipping in Hormuz in case of a military confrontation with the United States, which has imposed sanctions on Tehran in recent months.

Hormuz is a very narrow strait between the Persian Gulf and the Gulf of Oman, through which the majority of oil tankers heading for the West must pass.