CONSTANTA, Romania (AP) _ Firefighters extinguished a blaze early Tuesday that raged for 15 hours aboard a Bulgarian oil tanker and resulted in the death of at least one crew member.

A second sailor also was missing and authorities said there was little chance of finding him alive.

The fire started on Monday while the crew was cleaning a fuel tank on the ship as it was anchored just outside the port of Constanta, 155 miles east of Bucharest, said Alexandru Mezei, a port official.

The fire sent up plumes of smoke that blackened the air for miles around, authorities said.

Mezei said the cause of the blaze had not yet been determined.

The 75,000-ton Mesta oil tanker belongs to Navibulgar, the Bulgarian state-run shipping company.