By Tom Balmforth
KYIV (Reuters) -Ukrainian drones hit a munitions depot inside Russia overnight and there was a "high chance" of explosions at Russian military-industrial sites in the near future, a security source said on Sunday.
The source, who asked to remain anonymous, told Reuters the 9,000 sq. metre munitions storage facility was in the Russian region of Voronezh, which borders a chunk of northeastern Ukraine occupied by Russia since 2022.
Russia stored surface-to-surface and surface-to-air missiles, tank and artillery shells, and bullets at the depot, according to the source.
According to the source, the depot was near the village of Sergeyevka, which is about 85 miles from the nearest Kyiv-controlled territory.
Aleksander Gusev, Governor of Voronezh region, declared a state of emergency for a time after the drone attack. He said some residents had been evacuated, though there were no casualties.
Late on Sunday evening, Gusev, writing on the Telegram messaging app, said air defences had intercepted "several" drones over his region. There were no casualties or damage.
Reuters could not independently verify reports from either side.
Since Russia invaded it in 2022, Ukraine has been building a fleet of long-range drones to give it the ability to strike targets deep inside Russia.
"In the nearest future, there remains a high chance of sudden detonations at Russian military-industrial facilities, which are working (to supply) the war against Ukraine," the source said.
(Reporting by Tom Balmforth, writing by Max Hunder; Editing by Angus MacSwan, Elaine Hardcastle, Ron Popeski and Diane Craft)