The helicopter of the Leicester City owner crashed shortly after the start after a match in a parking lot outside the club grounds.
It is not known if Vichai Srivaddhanaprabha was in the helicopter at the time.
Leicester City played in his King Power Stadium West Ham United in the Premier League.
Pictures of the ground showed a big fire in the parking garage, which has since been extinguished.
- Live Updates: Helicopter Accident in Leicester City [1
Leicester City said the club supports police and emergency services and will provide a more detailed explanation
A spokesman for the East Midlands Ambulance Service said they received a report on the helicopter crash at 8:38 pm BST.
The service has asked the public not to be in the area.
Owned by Mr Srivaddhanaprabha & # 39; s, Leicester City won the Premier League in 2016 after starting the season as 5,000 / 1 outsider.
BBC Football commentator Ian Stringer said the helicopter was "spiraling" and eyewitnesses said it "came like a rock".
He said, "I saw the first-team employees break into tears, the reception area is silent and people are just crying."
Sky Sports News reporter Rob Dorsett said the helicopter had started off the field. as he does after every game.
He said he lost control after a few seconds and crashed into the parking lot only a few hundred yards away.
A witness said it was "the stern propeller did not work, he turned it".
Freelance photographer Ryan Brown reported on the game and saw the helicopter clean the King Power Stadium before it crashed.
He said 5 Live: "The engine literally stopped and I turned around and it made a little whirring noise.
" It became quiet, blades began to spin and then there was a big bang.  He said as he ran to the scene "there was a huge fireball" and it looked as if the helicopter had crashed into an industrial park next to the stadium.
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