Russian air defense units destroyed two drones targeting Moscow, Mayor Sergei Sobyanin said early on Thursday.

Axar.az reports, citing Reuters, Sobyanin, writing on the Telegram messaging app, said specialists were examining debris on the ground.

Moscow’s Vnukovo International Airport suspended departures and arrivals in response to the threat, news agencies quoted aviation watchdog Rosaviatsiya as saying. Restrictions were also in place for a time at airports along the Volga River.

The governor of the border region of Voronezh earlier reported that more than 40 drones had been destroyed throughout the day. In Bryansk region, also on the border, the regional governor said seven drones had been destroyed.

The Defense Ministry, in a report earlier in the evening, reported 18 drones had been destroyed over a three-hour period in several regions extending through central and southern Russia.