Locals in Sunny Hill says the reason an air ambulance landed on Caxton Park on Saturday was because someone playing football fell ill.
East Midlands Ambulance Service said it was unable to go into the specifics of what happened due to patient confidentiality.
But in a statement, the service said: “We received a call at 1.24pm on Saturday, July 18, to Coleridge Street in Derby.
“The caller reported that there was a medical emergency.
“We sent a doctor in a car, two paramedics in ambulance cars, a crewed ambulance and the air ambulance.
“One patient was taken to Royal Derby Hospital by helicopter.”
People locally have contacted Derbyshire Live to tell us what they believed took place.
One said: “It was a gentleman who collapsed while playing football with his friends.”
And another said: “It was a young footballer that had collapsed while playing. The police were helping to save his life and keep people away from the helicopter.”
The incident was reported to Derbyshire Live shortly before 2pm.
The air ambulance landed and later took off while there was also an ambulance, a paramedic car and police at the scene.
There was also a large group of onlookers who one reader said was a combination of other footballers and locals.