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Saudi Arabia intercepted additional missiles and drones launched by Yemen's Houthi rebels on Tuesday, with little sign of de-escalation in the fighting between the two sides.

The spokesman for the Saudi-led coalition said Tuesday that three drones were intercepted north of Riyadh, and two ballistic missiles fired toward Khamis Mushait near the Yemeni border were shot down. The coalition said personnel near an oil facility in Sanaa, Yemen's capital, should evacuate the area "for their own safety."

U.S. President Donald Trump issued what appeared to be a veiled threat against the Houthis on social media Tuesday, saying the group was deliberately trying to drive up oil prices "at Iran's behest" ahead of the November U.S. midterm elections. Trump wrote: "I thought they learned their lesson a year ago when we hit them hard, and then stopped at their request. After the midterms I'll still be here, and I will never forget this!"

Trump said over the weekend that he was considering joining Saudi-backed military action. The United States has already assisted Riyadh with intelligence, targeting and aerial refueling, but has so far refused to directly intervene in the Saudi-Houthi conflict.

Some corporate executives were unable to attend this week's World Petroleum Congress in Riyadh, and next month's Misk Global Forum was canceled by its organizers. Later this month, Riyadh plans to hold the Future Investment Initiative, an event that typically attracts Wall Street heavyweights such as BlackRock CEO Larry Fink and Citigroup CEO Jane Fraser, and which Saudi Arabia uses to promote its appeal as one of the region's leading investment destinations.

Citigroup CFO Gonzalo Luchetti said Tuesday that the bank has allowed Saudi employees to work from home but has not evacuated anyone. He said Citigroup is confident in managing the related disruptions.

Egypt said Tuesday it was prepared to provide any form of support in Saudi Arabia's fight against the Houthis. When asked about the possibility of Egypt providing military assistance, Egyptian Foreign Minister Badr Abdelatty said: "Whatever Saudi Arabia requests, we will of course respond."

According to the Saudi state news agency, Saudi Media Minister Salman Al-Dosary called for national unity to protect Saudi Arabia from Houthi attacks.

Turkey said Tuesday that President Recep Tayyip Erdogan held a phone call with the Saudi crown prince to discuss the Houthis' recent attacks. When asked Tuesday whether he would request Turkey's participation in the conflict, Trump replied, "I might do that." He described Erdogan as a "very good friend" and expressed confidence that the Turkish leader "would do what I ask."

UAE Foreign Minister Abdullah bin Zayed held a phone call with Saudi Foreign Minister Faisal bin Farhan. Aaron David Miller, who advised multiple administrations on Middle East policy at the U.S. State Department and is now a senior fellow at the Carnegie Endowment for International Peace, said that even if these countries directly intervened, they might not be able to stop Houthi attacks on Saudi Arabia. Miller said in an interview Monday: "The Houthis are determined to prove that geography is their advantage, and I don't think they will back down."

U.S. aviation authorities warned airlines to avoid flying to or over parts of Saudi Arabia, and the United States said Trump administration employees must obtain special authorization to use any airport in Saudi territory. The United States also specifically warned of the risks related to "filming, posting or sharing information" connected to military operations and their aftermath, noting that some U.S. citizens have been detained for taking photos of recent events.