A massive missile and drone attack destroyed one of Ukraines largest power plants and damaged others, officials said Thursday, part of a renewed Russian campaign targeting energy infrastructure.

The Trypilska plant, which was the biggest energy supplier for the Kyiv, Cherkasy and Zhytomyr regions, was struck numerous times, destroying the transformer, turbines and generators and leaving the plant ablaze. As the first drone approached, workers hid in a shelter, saving their lives, said Andrii Gota, chairman of the supervisory board of the state company that runs the plant, Centrenergo.

They watched the plant burn, surrounded by dense smoke and engulfed in flames. Its terrifying, said Gota. Hours later, rescuers were still dismantling the rubble.