Four crew members are still unaccounted for after a cargo ship started “heavily listing” and caught fire off the coast of Georgia early Sunday, according to the U.S. Coast Guard.

Authorities were first notified that the ship, the 656-foot Golden Ray, was listing in the early hours of Sunday morning in St. Simons Sound in Brunswick, Georgia. Coast Guard crews and officials from other agencies worked to rescue 20 of the 24 people on board, which included 23 crew members and one pilot. A fire on the ship forced them to temporarily stop.