Iran will give a decisive response to any "mistake" by the United States in the Gulf, the Revolutionary Guards navy said in a statement published on its news site Sepah News.

The U.S. military said on Wednesday that 11 vessels from the Revolutionary Guards navy had come dangerously close to U.S. Navy and Coast Guard ships in the Gulf, calling the moves "dangerous and provocative."

According to a U.S. military statement, the Iranian vessels approached six U.S. military ships while they were conducting integration operations with army helicopters in international waters.

At one point, the Iranian vessels came within 10 yards of the U.S. Coast Guard cutter Maui. The U.S. ships issued several warnings through bridge-to-bridge radio, blasts from the ships' horns and long-range acoustic noise maker devices. The Iranian ships left after about an hour, the statement added.

Iran's paramilitary Revolutionary Guards admitted the encounter on Sunday and said that its forces were conducting drills while facing "the unprofessional and provocative actions of the United States and their indifference to warnings.” 

"We advise the Americans to follow international regulations and maritime protocols in the Persian Gulf and the Gulf of Oman and to refrain from any adventurism and false and fake stories," Sunday's statement from the Iranian Guards navy said.

"They should be assured that the Revolutionary Guards navy and the powerful armed forces of the Islamic Republic of Iran sees the dangerous actions of foreigners in the region as a threat to national security and its red line and any error in calculation on their part will receive a decisive response."

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Iranian vessels get 'dangerously and provocatively' close to U.S. Navy ships

(With input from Reuters)