Crews from the air ambulance, paramedics and a Hazardous Area Response Team were all called to a "medical emergency".
Emergency services were called to a property in Langley Mill on Friday, May 29.
Nottinghamshire Live understands the incident happened at a commercial premises in Amber Drive.
An East Midlands Ambulance spokesperson said: "We were called on May 29 to Langley Mill to assist with a medical emergency.
"We sent two paramedics in ambulance cars, a crewed ambulance, our Hazardous Area Response Team and responders from the air ambulance."
A spokesperson for the Health & Safety Executive added: "HSE is aware and liaising with the police who have primacy."
Nottinghamshire Live is awaiting a statement from Derbyshire Constabulary on the incident.
