KIEV, October 31. /TASS/. Two explosions occurred at a critical infrastructure site in Kharkov in eastern Ukraine on Monday, city mayor Igor Terekhov reported.

"Two strikes on Kharkov. The strikes on a critical infrastructure facility in the city," he wrote on his Telegram channel.

It was reported earlier on Monday that the Kharkov subway’s operation was suspended. Also, an air raid alert was declared across Ukraine.