A drone attacked one of the largest oil refineries, Slavneft-Yanos, located in Yaroslavl, Russia.
According to Russian telegram channels, the "aircraft-type" UAV crashed near a hydrocracker unit on the morning of 29 January.
A fire broke out at the site of the drone's crash. According to preliminary reports, there were no injuries or damage. The crash site is currently cordoned off and bomb squads are working there.
After the drone crash, the plant's employees were temporarily allowed to go home.
Moscow is about 272 kilometres from Yaroslavl.