A drone threat has been declared in the Moscow region, APA's Russia bureau reports.
Residents have been advised to stay indoors and avoid approaching windows.
At the same time, those who are outdoors or in vehicles have been advised to take shelter in an underground passage or at a designated shelter.
A warning has also been issued that mobile internet services may be disrupted.
"Filming UAVs and air defense systems is prohibited," the notification sent to the public by the Unified State System for Emergency Warning said.