US embassy in Saudi Arabia urges Americans to 'exercise heightened vigilance' from Iranian, Houthi 'threats' The US embassy in Riyadh has warned Americans in Saudi Arabia and across the Middle East about potential "threats" from Iran and Yemen's Houthis. "Americans currently in the Middle East should exercise heightened vigilance due to the increased threat of armed attacks by Iranian-supported Houthis and Iranian efforts to target U.S. government officials in the region," it said in its latest advisory posted on X. "Iranian-supported Houthis have engaged in hostilities against Saudi Arabia, including attacks on civilian airports and other critical infrastructure resulting in civilian casualties and severe travel disruptions," it added."These hostilities have the potential to escalate rapidly beyond that immediate area."