US fears rapid escalation in Mideast after Houthis attack Riyadh

INTELLIGENCE SUMMARY

The United States warned Saturday that hostilities between Saudi Arabia and Iran-backed Houthis could "escalate rapidly" after a missile attack targeted Riyadh for the first time since the Yemen conflict resumed. 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 on Saturday.