A Maltese-flagged oil tanker received a warning of explosions on the water at the eastern mouth of the Gulf of Aden in the first potential Houthi attack against shipping in July.
The ship was heading west when it received a warning from a coalition warship about an incident close by, according to maritime security company Diaplous.
The ship, which was not identified, was 330 km east of the Yemeni coastal town of Nishtun.