The US Department of State has issued a security alert for American citizens in the Middle East, citing "complex" conditions and the "potential for unforeseen escalation" amid heightened regional tensions. The advisory urges Americans currently in the region to exercise "heightened vigilance" and to be aware of possible flight cancellations, airspace closures, and travel disruptions.

"Due to tensions in the Middle East, the security environment remains complex with the potential for unforeseen escalation," the department said in its advisory, as reported by The Indian Express and Outlook India.

The alert also advises Americans travelling to and from the region to monitor information about airport and airline operations. Washington further warned that Iran and groups supportive of Iran may target US interests overseas or locations associated with Americans, including businesses and other institutions.

"Iran and groups supportive of Iran may target S. interests overseas or at locations associated with the United States and Americans throughout the world, including S. businesses and other institutions," the advisory added.

The advisory came as the US Central Command (CENTCOM) announced on Tuesday (September 1) that American forces had completed a wave of strikes against Iranian military targets. According to CENTCOM, the strikes hit Islamic Revolutionary Guard Corps (IRGC) targets, including air defence sites, radar systems, maritime assets and facilities, mine-laying capabilities, and communications sites.

The attacks, CENTCOM said, followed "recent attempted attacks by the IRGC against commercial shipping in the Strait of Hormuz and against American service members."

In response, the Iranian military said that "dozens of the army's attack drones" had targeted radar systems and the positions of US forces at the Al Dhafra and Al Minhad bases in the United Arab Emirates, as well as other positions in Bahrain's Sheikh Isa Air base. The Revolutionary Guards also said they targeted US forces in Kuwait, Jordan, Bahrain, and Erbil in Iraq's Kurdistan region.

US President Donald Trump warned that if Iran retaliates, "they will be hit again at a much harder and higher level, but it will not be the biggest attack of them all, that is waiting in the wings."