WASHINGTON - Iran’s Revolutionary Guard Corps Navy fired warning shots over Singapore-flagged cargo vessel in international waters in the Gulf on Thursday, prompting the cargo vessel to flee into United Arab Emirates’ territorial waters, a U.S. official told Reuters, saying the account was based on preliminary information. The United Arab Emirates sent Coast Guard vessels toward the cargo ship and at some point the Iranian ships turned away, the official said. The official, who spoke on condition of anonymity, was unaware of any U.S. Navy involvement.