The sirens follow the eighth night of US-Iran strikes over the weekend, triggered by the death of two US service members in Iran's strike on a US military base in Jordan on Friday.
"Due to heightened tensions in the Middle East, the security environment remains complex with the potential for unforeseen escalation," the State Department wrote on its website.
According to the International Maritime Organization, at least 17 sailors have been killed since the beginning of the war, with three killed and over a dozen wounded in the last week alone.
Later, Iranian state television cited the Iranian Army as saying that it had targeted two US military bases in Kuwait.
The ministry said specialized security units intercepted a suspicious vehicle near the Syrian-Iraqi border and discovered a cache of long-range missiles, guided anti-tank missiles, and drones.
United States Central Command announced that two service members were killed in action, one is missing in action, and four were injured Friday in Jordan in a post on X/Twitter.
Khamenei threatened that "the noble Iranian nation and the Axis of Resistance have unforgettable lessons in store" for the US Army.
MIDDLE EAST AFFAIRS: The Islamic interpretation of the Yazidi faith is what members of ISIS used to justify the enslavement of over 6,000 women and children and the murder of more than 5,000 people.
Iran is likely trying to send a message to Syria. Iran wants weapons to continue to flow to Hezbollah via Syria.
Sirens, missile interceptions, and reported damage followed as Iran claimed attacks on US bases in Kuwait, Jordan, and Bahrain.
PALESTINIAN AFFAIRS: The PA president wants to remove any Israeli claim that Palestinians are not a partner for peace,’ said one Palestinian analyst, after the election announcement.
