STORY: "A Russian rocket hit an apartment building in Lviv," Kozytskiy said in the Telegram post. "There was a fire, which was quickly put out. There are victims."
The Interior Ministry put the death toll at four, and said 34 people had been wounded, including a child. Rescuers were continuing to work at the scene.
Ukraine's air force said Russia had attacked Lviv with Kalibr missiles launched from the Black Sea. It said seven out of 10 missiles were shot down.
Russia did not immediately comment on the attack. It denies deliberately targeting civilians despite repeatedly hitting residential areas in frequent air strikes across Ukraine.