A serviceman in Russian-occupied Crimea opened fire on fellow soldiers and civilians, killing four people and injuring four others, according to the Moscow-installed governor of Sevastopol.

Gov. Mikhail Razvozhayev said Tuesday that the shooting took place in the village of Khmelnytske, part of Sevastopol, but did not specify when the incident occurred.

According to the governor, the serviceman first shot at fellow soldiers, killing one and injuring another. He then allegedly opened fire on civilians, leaving three dead and three more wounded.

The suspect, whose identity was not disclosed, has been detained, Razvozhayev said. Authorities have launched an investigation into the shooting, though no information has been provided about a possible motive.

Russia annexed Crimea from Ukraine in 2014 in a move widely condemned by the international community as illegal. The Black Sea peninsula has since become a key strategic base for Moscow's military operations in Ukraine.

During the early stages of Russia's full-scale invasion, troops stationed in Crimea advanced into southern Ukraine and established a land corridor linking the peninsula to Russian-controlled territory.

In recent months, Ukrainian forces have stepped up strikes on Russian supply routes to Crimea, contributing to significant fuel shortages in the region, which typically attracts large numbers of tourists during the warmer season.