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Russia says a soldier is missing after an attack on its flagship Black Sea fleet in Crimea.
Video on social media shows plumes of smoke over the shipyard after Moscow claimed a Ukrainian missile hit its navy headquarters in Sevastopol.
The Moscow-installed governor warned residents another attack was possible and urged people to stay inside.
It comes just ten days after Ukraine launched one of its biggest attacks of the war on the fleet.
Air sirens could be heard in the city shortly after - governor Mikhail Razvozhayev said the alert was now over but urged people to remain cautious.
In a Telegram post, he said: "Attention everyone! Another attack is possible. Please do not go to the city centre. Do not leave buildings."
Last week, Ukraine attacked naval targets and port infrastructure damaging a submarine and a warship. Kyiv has not yet commented on this latest attack.