Two men have died following an explosion on an industrial estate.
Police, paramedics and firefighters were called to digger bucket manufacturer Harford Attachments in Spar Road, Hellesdon, Norwich, at 9.20am.
A Norfolk Police spokesman the two victims, one aged in his 50s and one in his 20s, are both thought to have worked at the premises. No-one else needed medical attention.
A helicopter from the East Anglian Air Ambulance was also deployed, although the crew did not include the Duke of Cambridge, who began work with the charity today.
The estate was largely shut off to the public while the incident was dealt with.