An attack on Iraq's Basra port early Thursday killed at least one person and forced authorities to halt operations at all the country's oil terminals, officials said.
Videos circulating online showed a large vessel engulfed in flames, with massive plumes of fire and thick black smoke billowing into the sky.
Farhan al-Fartousi, the director-general of the General Company for Ports of Iraq, made the announcement in a statement carried by the state-run Iraqi News Agency on Thursday.
Al-Fartousi said the attack targeted a ship engaged in a ship-to-ship transfer of oil in the Basra port on the Persian Gulf.
He said it remained unclear if the ship was targeted by a flying or seaborne drone or a missile.
Rescuers recovered one dead body and helped 38 others after the attack.
He said commercial ports in Iraq remained open, though the oil terminals had been shut.