US Central Command also denied claims by Iran's Revolutionary Guards that they had struck the headquarters of the US Navy's Fifth Fleet in Bahrain and a separate air base in the region.

"Iran launched several ballistic missiles toward regional neighbours; however, all failed to hit their intended targets," Centcom said in a statement.

"Two Iranian missiles fired at Kuwait fell short or broke apart en route, and three missiles launched at Bahrain were immediately intercepted by US and Bahrain air defense forces."

Kuwait's military said its air defenses were intercepting "hostile" missile and drone attacks.

The US military also shot down three attack drones that had been launched by Iran "toward civilian mariners that were rightfully transiting regional waters," Centcom said.

Qeshm Island is located in the strategic Strait of Hormuz, the key shipping channel for Gulf oil and gas that has been effectively closed by Tehran since the start of the war with the US and Israel in late February.

In a statement carried by the official IRNA news agency, the Revolutionary Guards claimed that they had struck the US military installations in response to the strike on Qeshm Island. A ceasefire has been in place between the United States and Iran since April 8, but subsequent talks to try to put a more permanent end to the conflict have so far been unsuccessful.

Earlier, US forces fired a missile at a ship that was attempting to sail toward an Iranian port in violation of an American blockade, disabling the vessel. Washington has now forcibly halted six ships it said were attempting to violate the blockade, which has been in place since April 13.