MOSCOW, June 6 (RIA Novosti) - Seven bodies have been recovered following an explosion and fire aboard a civilian cargo ship moored at a military dockyard in Russia's Baltic exclave of Kaliningrad, a navy spokesman said on Friday.

The fire on the Yenisey container ship, which was undergoing repairs at the naval port of Baltiisk, broke out at around 3:00 p.m. Moscow time (11:00 GMT) on Thursday, and raged for six and a half hours. The cause of the blaze is not yet known, but is believed to be a fuel tank explosion.

"Seven bodies have been found at the scene of the fire at the ship's aft deck," Capt. 1st Rank Igor Dygalo said, adding that at least three people were still missing.

A special commission led by Navy Commander Adm. Vladimir Vysotsky has started an investigation at the scene.

"Rescue workers are clearing the debris and searching for those missing," Dygalo said.