A drone hit a U.S.-owned gas storage tanker at Egypt's Mediterranean port ​of Damietta, British maritime security firm Ambrey said in an initial assessment on Wednesday, in a potential spread of the Middle East war. The drone hit floating storage tanker Energos Winter, causing a fire that ‌then spread to another vessel, three trading sources familiar with the incident said. A statement from Egypt's petroleum ministry confirmed a fire at the port but made no mention of a drone attack. There was no immediate claim of responsibility for the incident, which the ministry said was dealt with immediately with no casualties. Washington and Riyadh said ​they struck the Iran-backed armed groups in Iraq in retaliation for drone attacks on Saudi oil targets launched from Iraq.