Four workers are feared to have died in an industrial accident in Great Yarmouth in Norfolk.
Emergency services were called to Claxton Engineering in the North River Road area at about 1420 GMT following reports of an accident.
Police, fire and ambulance services were at the scene and the Health and Safety Executive has been informed.
Police confirmed there had been fatalities in the accident, but would not be drawn on the number.
The BBC understands four people suffered fatal injuries when a steel structure fell or tilted onto them.
Claxton is an offshore engineering company.
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