Yeah, its called a "Heavy Flamethrower" in Russian service, but we would call it a Multiple Rocket Launcher. Goes far, big boom. Not the most "precision" weapon, but great for deleting something off the map.

I think they have left open escape corridors and given civvies 48hrs to clear out ? They seem to be doing that everywhere else.

Its Mariopol though where those video have leaked that show people trying to leave town getting pulled over and kidnapped / shot