Thousands of search and rescue workers from across Russia, including more than 100 Navy divers, converged on the Black Sea port of Sochi Sunday, searching for clues to the crash of a military plane that plunged into the sea with 92 people on board.

A military spokesman said there were no survivors from the flight, which carried dozens of singers from the internationally acclaimed Alexandrov Ensemble, the official choir of the Russian armed forces.

President Vladimir Putin declared Monday a nationwide day of mourning, as search teams prepared to work through the night to find evidence that could help determine why the TU-154 jetliner crashed two minutes after takeoff.

"We will conduct a thorough investigation into the reasons and will do everything to support the victims' families," Putin said.

Hours after the crash, officials said debris from the aircraft and some bodies had been recovered just off the Russian coast, with the main section of the plane found in 70 meters of water and 1.5 kilometers off the coast.

Authorities said there was no immediate evidence of terrorism, while cautioning that criminal activity had not been ruled out.

Russia's RIA Novosti news agency, quoting an unidentified source, said the plane likely crashed because of a technical malfunction or pilot error.

The Soviet-era jetliner was carrying 84 passengers and eight crew, including nine Russian reporters.

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