“The enemy launched a missile attack on the headquarters of the fleet,” Sevastopol governor Mikhail Razvozhayev said on Telegram.
Over the past month, Ukraine has stepped up attacks on Russian military bases and other installations, including air defenses, in Crimea.
Sevastopol, home to Russia’s Black Sea Fleet headquarters, is one of the largest cities on the Crimean peninsula and was illegally annexed by Moscow’s forces in 2014.
Russian state media TASS reported that debris was “scattered for hundreds of meters” following the missile strike. TASS added that a large number of ambulances were on their way to the scene of the attack.
Razvozhayev also said a piece of shrapnel fell near the Lunacharsky Theater.
The Russian-appointed governor said operational services went to the scene of the attack and that information about any casualties is being clarified.
He also warned that another attack is possible and told residents to avoid the city center and not leave buildings.
It comes after the Ukrainian military says it successfully hit a Russian command post in Crimea on Wednesday.
Strategic Communications Directorate of the Defense Ministry posted on Telegram that “On the morning of September 20, the Ukrainian Armed Forces inflicted a successful strike on the command post of the occupiers’ Black Sea Fleet near Verkhniosadove near the temporarily occupied Sevastopol.”