Yemen's Houthis said on Friday they fired two ballistic missiles at Saudi forces in Jazan. The group also claimed attacks on Riyadh's King Khalid International Airport and a pipeline pumping station. Saudi officials did not confirm these reports. Jazan houses a major oil refinery that often faces such drone attacks.

CAIRO, Nov 13 (Reuters) - Yemen's Iran-aligned Houthis said on Friday they had fired two ​ballistic missiles at what they described as concentrations of Saudi ‌forces in Al-Tuwal in Jazan province, hours after Saudi civil defence issued an all-clear for the province.

It was not immediately clear whether the attack ​claimed by the Houthis was related to the alerts ​issued by Saudi civil defence in Jazan earlier on ⁠Friday.

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Jazan is home to a Saudi Aramco refinery with ​a capacity of 400,000 barrels of crude oil per day. Southern ​Saudi Arabia, which borders Yemen, has come under repeated missile and drone attacks by the Houthis on military installations and energy infrastructure, including the Jazan ​refinery.

The group also said in a separate statement that ​it had attacked Riyadh's King Khalid International Airport and a pumping station on ‌Saudi ⁠Arabia's East-West Pipeline. There was no immediate Saudi confirmation of the Houthi account.

With the conflict in the Middle East disrupting oil flows through the Strait of Hormuz, Riyadh has rerouted ​about 4 million ​barrels per day ⁠of crude via the East-West Pipeline to the Red Sea port of Yanbu, equivalent to about ​4% of global supply.

Fighting between the Houthis ​and the ⁠coalition backing Yemen's internationally recognised government has intensified after the Houthis advanced in September towards the Bab el-Mandeb Strait, a strategic shipping ⁠chokepoint ​at the southern entrance to the ​Red Sea, across the Arabian Peninsula from the Strait of Hormuz.