LONDON, Sept 16 (Reuters) - Two major facilities at the heart of Saudi Arabia's oil industry were attacked on Saturday, shutting down more than 5% of global supply.
* Yemen's Iran-aligned Houthi group, which is battling a Saudi-led coalition in Yemen, claimed responsibility, saying it used drones.
* U.S. Secretary of State Mike Pompeo ruled out Yemeni involvement and accused Iran of leading the attacks on facilities run by state-owned Saudi Aramco.
* U.S. President Donald Trump said the United States, which has been embroiled in a row with Iran over its nuclear ambitions, was "locked and loaded" for a potential response.
* An Iranian Revolutionary Guards commander said U.S. bases and aircraft carriers were within range of Iranian missiles, after Washington blamed Iran for the attacks.
* Sunni Muslim Saudi Arabia has previously accused Shi'ite Muslim Iran, which lies across the Gulf, for attacks on oil-pumping stations and the Shaybah oilfield, which Tehran denies. It has not blamed any party for Saturday's strike.
* The attack, which knocked out about 5.7 million barrels per day (bpd) of Saudi output, struck Saudi oil-processing facilities at Abqaiq and Khurais.
* Abqaiq, in eastern Saudi Arabia, processes crude from the giant Ghawar oil field for export to the Gulf terminals Ras Tanura and Juaymah and to Red Sea terminals.
* Oil prices soared on Monday, with Brent crude posting its biggest intra-day percentage gain since the Gulf War in 1991.
* Analysts said benchmark Brent, now trading at about $66 a barrel, could hit $100 if Riyadh fails to quickly bring back supply.
* The attack, which knocked out more than half of Saudi Arabia's output, also constrained its ability to use more than 2 million bpd of spare oil capacity held for emergencies to compensate for any major global supply disruption.
* Saudi Arabia's return to full oil supply capacity could take "weeks not days", a source close to the matter told Reuters on Sunday.
* Saudi Aramco has been seeking to prepare for what is expected to be the world's largest share sale.
* Saudi Arabia is the world's biggest exporter, shipping more than 7 million barrels of oil to global destinations every day, and for years has served as the supplier of last resort to markets.
(Compiled by Edmund Blair; Editing by Catherine Evans)