Leicester City's charismatic Thai chairman was the subject of growing concerns on Sunday after a helicopter belonging to the billionaire crashed and burst into flames in the stadium carpark shortly after taking off from the club's pitch.
The helicopter was seen enveloped in flames in mobile phone images from the scene and an AFP photographer later saw smoke coming from the wreckage.
It crashed shortly after take-off following Saturday's game against West Ham in a car park close to King Power Stadium -- a scene of jubilation two years ago when underdog Leicester City won the Premier League in a remarkable footballing feat.
“Emergency services are currently at the King Power Stadium where an aircraft came down in a car park behind the ground,” police said.
There was no confirmation whether London-based Vichai Srivaddhanaprabha, who frequently flies to and from Leicester's home games by helicopter, was on board the aircraft which appeared to develop mechanical problems.
The BBC's Southeast Asia correspondent tweeted that a “source close to the family” had confirmed he was on board, but there was no word from Leicester City or from Thai officials of King Power, Vichai's duty-free shopping empire.
'A huge fireball'
Freelance photographer Ryan Brown, who was covering the game, told BBC Radio 5 Live he saw the helicopter rise out of the stadium before it crashed.
“Literally the engine stopped and I turned around, and it made a bit of a whirring noise. It turned silent, blades started spinning and then there was a big bang,” he said.
He said he saw “a huge fireball” when he ran to the scene.
The identities of the pilot and any passengers on board have not yet been confirmed. It is also not yet known if anyone on the ground was injured.
“We are assisting Leicestershire Police and the emergency services in dealing with a major incident at King Power Stadium,” the club said in a statement.
Vichai, who owns the King Power company, bought the club in 2010 and became chairman the following February.
He is a beloved figure in the club and the city.
“Thoughts and prayers with all -- particularly owners who've done so much for Club and our City,” Leicester's mayor Peter Soulsby tweeted.
Leicester footballers Jamie Vardy and Harry Maguire both tweeted praying hands emojis.
Sky Sports said the helicopter took off from the pitch between 1930 and 1945 GMT but developed problems shortly afterwards with its tail rotor.
The local ambulance service said it was alerted at 2138 GMT.
“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,” it tweeted.
Air crash investigators are also examining the scene.
It was under Vichai's ownership that Leicester created one of the biggest shocks in English football history by winning the 2015/16 Premier League, having started the season as 5,000/1 outsider for the title.
West Ham defender Pablo Zabaleta, who played in Saturday's game, tweeted: “My thoughts and prayers are with all those involved in the helicopter accident at Leicester City.”
His team-mate Declan Rice tweeted: “Horrendous scenes at the king power tonight, my prayers & thoughts go out to everyone involved at Leicester.”
Footballing legend Gary Lineker, a former Leicester City player who was presenting BBC 's Match of the Day when the crash happened, tweeted: “That was the most difficult @BBCMOTD I've ever hosted... A terrible tragedy. Heartbreaking.”
Vichai made major investments in the club after his purchase, returning it to England's Premier League from the second-tier Championship in 2014.
It seemed initially outmatched by richer and more established clubs from London, Liverpool and Manchester, languishing at the very bottom the table for most of the 2014-15 season.
The Foxes, as the team is known, then engineered what fans now fondly refer to as the “Great Escape”, winning seven of its last nine matches.
It ended up finishing 14th, securing itself another season in Europe's richest league in 2015-16.
But not even its most devout fans could have imagined what happened next.
Vardy, signed from unheralded Fleetwood Town, scored in 11 consecutive matches, propelling the men in blue to a title without parallel in Premier League history.
The success also helped qualify for the Champions League, the lucrative championship played by Europe's most successful sides, including Barcelona and Real Madrid.
There, Leicester City defied the odds yet again, winning its group before eventually losing the quarterfinal 2-1 over two matches to Atletico Madrid.
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