The China Mail - US warns of rapid escalation in Middle East war

US President Donald Trump cut short a weekend at Camp David, a secluded presidential complex in rural Maryland, to return unexpectedly to the White House.

The White House gave no explanation for the early return, which comes as a new threshold was crossed in the conflict between Saudi Arabia and the Houthis, who control a large part of Yemen and are fighting government forces backed by a coalition led by Riyadh.

Loud explosions rang out on Saturday in the Saudi capital, where AFP journalists saw a fuel tank bearing the logo of oil giant Aramco on fire near the airport.

"This military conflict has the potential to escalate rapidly," the US State Department warned, adding American citizens outside the Middle East should "seriously reconsider travel to and through the region".

Separately, the State Department restricted travel for American government employees to the Saudi cities of Taif and Yanbu, home to a major Red Sea oil export terminal that has previously been targeted by Houthi strikes.

In recent weeks, the Houthis' lightning offensive seizing swathes of Yemeni territory has left hundreds dead and, according to the UN refugee agency, displaced more than 110,000 people.

- 'Intercepted' -

The violence has already disrupted exports from Saudi Arabia, the world's leading supplier of crude oil, as well as maritime traffic.

Saudi Arabia's ally the United States has sent mixed signals. According to US news platform Axios, Washington refused last week a Saudi request to strike the Houthis, and Fox News reported Sunday that Trump had said the Houthis have agreed not to hit US targets.

On Sunday, US Central Intelligence Agency Director John Ratcliffe met Egyptian President Abdel Fattah al-Sisi in a rare visit to Cairo.

The visit came days after Saudi Crown Prince Mohammed bin Salman was also in the Egyptian capital, where he and Sisi urged safe and secure navigation through Bab al-Mandab, after the Houthis seized the Yemeni coast.

The Bab al-Mandab strait is a Red Sea waterway that is crucial to energy flows and global shipping and which has become even more strategic since Iran imposed a blockade on the Strait of Hormuz.

Condemning the Houthis' latest attacks, Turkey's Foreign Minister Hakan Fidan told the broadcaster NTV that his country had discussions with Saudi Arabia and Pakistan, partners in a mutual defence pact, about possible assistance.

"In this regard, military needs, especially in state technical matters, may happen. There would be no problem in meeting this demand either," he said.

Saudi Arabia meanwhile has scrambled to contain the fallout of the Houthis' attacks on its territory.

On Sunday, the attack on Riyadh was not mentioned in several major Saudi papers, even though hours beforehand, the Riyadh-led coalition had confirmed that a ballistic missile launched by the Houthis was "successfully intercepted and destroyed".

The coalition added that the pro-Iranian fighters had tried to target "civilians and civilian infrastructure" in several cities in the west of the kingdom, including the port of Yanbu on the Red Sea, an important export hub for Saudi oil.

Saudi Arabia has responded with scores of airstrikes on Houthi-held areas but has failed to stop the fighters' advance in Yemen.

Claiming responsibility for the attack, Houthi military spokesman Yahya Saree said fighters had carried out "two successful military operations using a large number of ballistic and cruise missiles and drones".

"The first targeted sensitive sites in the Saudi capital, Riyadh, and the second targeted Aramco facilities in Yanbu."

- Lightning offensive -

According to Andreas Krieg of King's College London, the attack on Riyadh, the first to threaten the Saudi capital since Yemen's civil war resumed, crossed "an important psychological threshold".

"Saudi Arabia can absorb intermittent attacks on remote military or energy installations more easily than repeated threats to Riyadh itself," he told AFP.

"Strikes around airports, fuel storage and populated areas make restraint politically and strategically much harder to sustain."

The attack has piled further pressure on a global economy already rocked by seven months of war in the Middle East, which began in February with US-Israeli strikes on Iran and which has seen the Islamic republic respond with attacks around the region.

Iran-backed groups also got involved, with Hezbollah in Lebanon and the Houthis in Yemen carrying out attacks against their foes.

Iran's top negotiator said Tehran had conveyed to the US through mediators its conditions for reopening the Strait of Hormuz, which it has blockaded throughout the Middle East war, and Foreign Minister Abbas Araghchi set off on Sunday for New York to attend the UN General Assembly.

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