Russia fired cruise missiles at a western Ukraine city far from the front line of the war, killing at least six people in an apartment building in what officials said was the heaviest attack on civilian areas of Lviv since the Kremlin’s forces invaded the country last year.

Emergency crews with search dogs went through the building after the night time attack on the roof and the top two floors on Thursday. Nearly 36 people were injured, according to authorities.

Lviv Mayor Andriy Sadovyi said the body of a woman was pulled from the rubble late Thursday, bringing the death toll to six. Kozytskyi said seven survivors were rescued from the wreckage and a total of 14 people hospitalised. Sadovyi said around 60 apartments and 50 cars in the area of strike were damaged. He announced two days of official mourning.

The Ministry of Internal Affairs said 64 people had to leave their homes.Ukrainian President Volodymyr Zelenskyy promised “a response to the enemy. A tangible one”.