One person was killed and four were taken to hospital after a building collapsed at the Didcot-A coal-fed power plant in southeast England owned by RWE AG’s U.K. unit Npower on Tuesday.

Emergency services were called to an incident that happened while a demolition contractor was working at the plant, the company said in a statement. Three people are missing.

Npower’s Didcot-A station closed in March 2013 and is being dismantled. Demolition is due to be completed by the end of this year, according to the company’s website. Both units of the Didcot-B gas-fired plant are operating, according to National Grid Plc data.

The company is working with the emergency services to understand the cause of the collapse, it said. The Didcot power stations are about 60 miles (97 kilometers) west of London.

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