A 17-year-old amateur boxer has died after collapsing in the ring during a bout.
The youth, named in reports as Ed Bilbey, was given treatment at the fight but was pronounced dead after arriving at hospital.
Police confirmed they were called to the Post Mill Centre, South Normanton, at 10.17pm on Friday night.
The centre's website stated that an "amateur open boxing show" was being held at the venue between 7pm and 11pm that night, organised by the South Normanton School of Boxing.
Meanwhile, police have appealed for anyone with footage of the bout to contact the investigations team.
A force spokesman said: "At this stage there don't appear to be any suspicious circumstances surrounding this death but if you were at the tournament and have any footage of the bout or information that might help, please contact Detective Sergeant Debbie Yoxall on 101, quoting incident number 1162 of March 24."