The helicopter which belongs to Leicester City owner Vichai Srivaddhanaprabha has crashed in the vicinity of the King Power Stadium.
The incident occurred after Leicester's 1-1 draw with West Ham in the Premier League on Saturday night.
A Leicester police statement said: "Emergency services are currently at the King Power Stadium where an aircraft came down in a car park behind the ground.
"Enquiries to establish the exact circumstances of the collision are ongoing."
East Midlands Ambulance Service NHS Trust tweeted: "We received a call at 8.38pm this evening to reports of a helicopter crash near King Power Stadium.
"We sent a doctor, two paramedics in ambulance cars, a crewed ambulance and our Hazardous Area Response Team, with the first resource arriving within two minutes of the call.
"We are currently working with our colleagues in Leicestershire Police and Leicestershire Fire and Rescue Service at the scene.
"We advise members of the public to stay away from the area while we deal with this incident."
Sky Sports News reporter Rob Dorsett said: "At about 8:30 this evening, eyewitnesses told me they saw the Leicester City owners' helicopter take off from the pitch inside the King Power Stadium - as it does after every game - and after a few seconds it appeared to lose control.
"It was sent spinning out of control and crashed in the car park at the rear of the King Power Stadium, just a few hundred metres away from where the pitch is."
We understand Leicester vice-chairman Aiyawatt Srivaddanaprabha and Leicester Director of Football John Rudkin were not among the passengers.
A Leicester City spokesman said: "We are assisting Leicestershire Police and the Emergency Services in dealing with a major incident at King Power Stadium.
"The club will issue a more detailed statement once further information has been established."
Srivaddhanaprabha leaves the stadium by his helicopter, which lands in the centre circle on the pitch, after every Leicester home game.
Under his ownership, Leicester won the Premier League title in the 2015/16 season.