The 10 pirates were captured last week after seizing a Russian oil tanker but were then unexpectedly released, with Russian officials saying there was insufficient legal basis to keep them in detention and that they would be too expensive to feed.
"According to the latest information, the pirates who seized the Moscow University oil tanker failed to reach the shore. Evidently, they have all died," the high-ranking source was quoted as saying by Russia's official news agencies.
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Reports have said that after their release the Russian navy put the pirates in a boat some 300 nautical miles offshore, removing all weaponry and navigational equipment from the vessel.
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