Iran live updates: Pentagon names soldier killed in Iraq by downed Iranian drone

Bahrain's Interior Ministry said on Tuesday morning that air raid sirens were sounded, urging residents "to remain calm and head to the nearest safe place."

The State Department issued a "worldwide caution" for American citizens early on Tuesday "due to heightened tensions in the Middle East."

"The security environment remains complex with the potential for unforeseen escalation," read the statement, which was shared by regional embassies. "Americans currently in the Middle East should exercise caution and heightened vigilance and should be prepared for possible flight cancellations, periodic airspace closures and potential travel disruptions."

"Please monitor embassy and consular security alerts, local authorities, and the news for breaking developments. Americans outside the Middle East should reconsider travel to and through the region," it added.

"U.S. diplomatic facilities, including outside the Middle East, have been targeted. Iran and groups supportive of Iran may target other U.S. interests overseas or at locations associated with the United States and Americans throughout the world," the statement said.

U.S. Central Command said late on Monday that it completed its 10th consecutive night of strikes on Iran.

The attacks targeted "Iranian military command centers, maritime capabilities, missile and drone launch sites, and air defense systems to degrade Iran's ability to continue attacking commercial vessels flowing through the Strait of Hormuz," CENTCOM said in a post to X.

-ABC News' Alex Ederson

At 4 p.m. ET, the U.S. began attacking Iran with another volley of strikes for the 10th consecutive day. CENTCOM said the “strikes are designed to further degrade Iranian military capabilities used to attack commercial shipping in the Strait of Hormuz."

-ABC News' Steven Beynon