The incident took place Sunday, when Britain celebrated Bonfire Night, traditionally marked with fireworks to celebrate the Guy Fawkes’ gunpowder plot to blow up Parliament in the 17th century.
The man suffered burns and other unspecified internal injuries in the incident in Sunderland, 275 miles north of London.
Katherine Shenton, a spokeswoman for the North East Ambulance Service, said a caller had phoned in that the victim was bleeding after the firecracker exploded.
Several of the man’s friends recorded the incident on a mobile phone. The blurry images show a man bent over with his pants down and a white flash as the firecracker explodes.
The Times newspaper reported the man is a soldier who recently returned from Iraq.
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