At least 3 dead and 4 missing in an explosion at a hydroelectric plant in Italy

MILAN (AP) — An explosion Tuesday at a decades-old hydroelectric plant in northern Italy killed at least three workers and injured five others, a regional fire chief said. At least four other people were missing.

The explosion at power company Enel's Bergi plant south of Bologna during maintenance work collapsed part of the nine-story underground structure, provoked a fire and caused flooding at depths of up to 60 meters (200 feet), regional fire chief Francesco Notaro told SKY TG24.

Search efforts were proceeding with care due to the risk of additional collapsing. Divers were aiding the search, which was expected to go through the night.

Video provided by firefighters showed smoke rising from underground at the lakeside power plant.