Criminal cases have been opened against the captains of two vessels that did not render aid to the Bulgaria riverboat, which sank in Russia's Volga River, the Russian Investigative Committee said.

The latest casualty report says 205 people were onboard when the vessel capsized and sank in under three minutes. The Emergencies Ministry confirmed the death of 88 people, 11 of them children. Of the over 200 on board, 79 were rescued by another passing cruise boat, the remaining are presumed drowned.

The two ships in question are a tug and barge and an oil vessel. The names of the captains were not immediately available.

Several minutes after the Bulgaria overturned and sank, another passenger cruise ship, the Arabella, came to the aid of the survivors and began pulling them on board.

Russian Transport Minister Igor Levitin said on Monday the captains of two passing vessels who failed to come to the aid of the Bulgaria will get "maximum punishment", RIA Novosti reported.