KIEV, October 17. /TASS/. An air raid alarm was declared in Kiev for the fourth time in one day, the city administration said.

"Attention! Air raid alarm declared in Kiev! We urge everyone to immediately proceed to civil protection shelters!" the administration said on its Telegram channel.

The authorities have already declared air raid alarm in Kiev for three times on Monday.

Air raid alarm was also declared in Odessa and Nikolayev regions, with an explosion heard in the Odessa Region.

The air raid alarm in the Nikolayev Region was declared by head of the region Vitaly Kim. The air raid alarm in the Odessa region was declared by the Odessa city council.