English Premier League side Leicester City owner's helicopter crashed outside the club's King Power Stadium shortly after taking off from the pitch on Saturday.
It was not immediately clear whether Vichai Srivaddhanaprabha, the Thai businessman who bought the club in 2010, and his son Aiyawatt, the club's vice chairman, were on board.
Leicester City later tweeted, "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."
A video footage posted to Twitter showed a large fire burning in the wreckage in a car park near the stadium.
John, a Leicester fan, told Sky News that he was in the club bar when the helicopter spun out of control.
"We were in the bar facing the King Power - my nephew was in a real state of shock. He said he saw this helicopter out of control then drop within a second and burst into flames. He was so upset - we're all thinking about the owners here and what they've done for the football club. It's awful, you can't believe it," he said.
The Leicester police confirmed the incident, saying an investigation is underway.
"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," police tweeted.
The helicopter always takes top club officials before each match and takes off from the pitch after the match.
Vichai lives in Thailand most of the time and he was not seen during the club's 1-1 draw with West Ham Saturday afternoon. His son Aiyawatt is responsible for the club's daily management.
The Thai family made history for the club, leading them to promotion to the Premier League and then shocking the world by taking the club to Premier League champions in the 2015-2016 season.
