AVIATION officials are investigating an incident at the iPro Stadium in which a drone flew over the crowd and took a video of the game.
The Civil Aviation Authority said the incident, along with four others, is being looked at for a breach of the rules on the flying of drones.
The drone was first spotted at the Derby County's Capital One Cup game against Reading on Tuesday, September 23.
It was then spotted again at the Rams match against Bournemouth on Tuesday, September 30.
Following the first incident, the Derby Telegraph contacted the authority, which said it would look at the incident.
A spokesman for the Civil Aviation Authority (CAA) said: "We currently have five formal investigations running which are looking into a number of potential breaches of the Air Navigation Order relating to the use of drones.
"In addition, we are working with several police forces across the country on similar drone-related investigations, which they are leading."
A spokesman for Derbyshire police could not confirm whether or not the force was one of those investigating the issue.
The videos have ben uploaded to YouTube by user PV2+ Adventures. Videos on the page show footage of other football clubs, including Leicester City and Nottingham Forest, along with well-known attractions like Chatsworth.
The laws around drones are covered by the CAA and there are strict regulations about how close a vehicle can be flown to large crowds.
The regulations state that operators of small unmanned aircraft involved in flying close to people or objects require permission from the CAA.
Specifically, that covers flight over or within 150 metres of any congested area, or within 150 metres of an organised open-air assembly of more than 1,000 people.
A list of operators which have been given permission by the authority was provided to the Derby Telegraph and the user's name of PV2+ Adventures could not be found on it.
A spokesman for Derby County said: "The club are concerned at the use of these unlicensed drones over the iPro Stadium. We have spoken to Derbyshire police and the Civil Aviation Authority and they are investigating the incidents.
"The recording of live match action contravenes Football League Rights access but of more concern is the danger posed by the drones so close to a football stadium with over 20,000 people in it.
"The operators of the drones didn't even have the common courtesy to ask permission."
The Derby Telegraph has tried to get in touch with the operator of the drone but has not had a reply from them.
