A helicopter believed to be carrying Vichai Srivaddhanaprabha, Leicester City’s chairman, crashed outside the King Power Stadium following the club’s match on Saturday night.

A source briefed by the football club said that Vichai was one of at least five people on the flight. It is not known whether there were any survivors. Police said on Sunday afternoon that they were working towards providing the public with an update on what had happened.

The incident occurred around an hour after the final whistle. The Thai owner’s helicopter crashed near a car park near the south-east corner of the stadium shortly after taking off from the pitch at around 8.30pm.

Facebook Twitter Pinterest Vichai Srivaddhanaprabha Photograph: Mike Egerton/PA

Eyewitness reports indicated that the helicopter only just cleared the roof of the stands, stayed in the air briefly and spiralled down to earth after reportedly developing a fault with its tail rotor. A huge fireball erupted and the air smelt of burning fuel in the hours after the crash. Emergency services rushed to the scene to tackle the fire and search the wreckage, with the area eventually cordoned off by Leicestershire police.

It is understood that the helicopter fell outside a fence surrounding the stadium perimeter. However it crashed on land owned by the club, landing near car park E, which is used by Leicester’s staff. It is unclear whether the helicopter landed on any objects or if any bystanders were injured by the crash. The areas around the stadium had largely emptied after the game. West Ham’s squad were already on their way back to London at the time.

With the football world reeling from the news, hundreds of supporters came to the Leicester ground to lay a blanket of bouquets, football shirts and scarves on the concourse. A large image of the Hindu god Ganesh had also been propped amongst the flowers.

Many Leicester players tweeted messages of support for the club and the owner’s family. The club has cancelled training for Sunday and it is expected that Tuesday night’s Carabao Cup match against Southampton will be postponed.

Play Video 0:57 Chelsea, Arsenal, Burnley and Palace pay tribute after Leicester City helicopter crash – video

Players in Premier League matches on Sunday wore black armbands as a mark of respect. The Leicester manager, Claude Puel, spoke of his sadness at the news. “It’s a tragedy for the club,” he said. “I think very strongly about the victims and their families… I’m terribly sad.”

Former England and Leicester manager Sven-Goran Eriksson hailed the “incredible” impact Srivaddhanaprabha has had on the club.

Eriksson, the first manager to be hired by the Thai billionaire after he took charge of the club in 2010, told BBC Radio Five Live: “It’s frightening news… I still hope it’s not true.”

“I knew the whole family and the father. When you know him, as i did, you knew he’s a very, very generous man - to the players, the staff and people working for him - with the fans and the community. He’s an extremely generous man.”

As events unfolded on Saturday night, there was confusion outside as security personnel attempted to restore order and prevent members of the public from taking pictures and filming videos of the wreckage. Supporters in the area walked away in obvious distress and Kasper Schmeichel, Leicester’s goalkeeper, was seen in tears outside the ground.

Facebook Twitter Pinterest Emergency services attend to the wreckage of the helicopter outside Leicester City’s King Power Stadium. Photograph: Ben Stansall/AFP/Getty Images

Tim Acott, a Leicester season ticket holder of 40 years, said: “It just came out of the stadium already spinning, then down to the ground. Just in a spiral. It hit the ground with a big bang then burst into flames. It’s over on the other side of the car park, I don’t think there were people there. I’m shaking like anything.”

Aiyawatt Srivaddhanaprabha, Leicester’s vice-chairman and Vichai’s son, was not at the game.

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.”

Leicestershire police said in the early hours of Sunday that the air accident investigation branch (AAIB) was leading the investigation into the circumstances of the crash.

The force said: “A cordon is currently in place at the scene to enable the AAIB to examine the area and complete their initial enquiries.

“Leicestershire police will be supporting the AAIB in its investigation, liaising closely with Leicester City football club as enquiries continue.”

The AAIB confirmed on Sunday morning its investigators had been deployed at the site.

A spokesperson for King Power, Vichai’s company in Thailand, declined to comment on Sunday morning.

West Ham’s vice-chairman, Karren Brady, expressed her sympathy on Twitter: “My thoughts and prayers are with everyone at Leicester City, horrific pictures on the news, I pray everyone is ok. I can confirm everyone from WHU has safely left the stadium.”

Vichai, who bought the east Midlands club for £39m in 2010, is normally flown back to London in his private helicopter after home games. He has become a hugely popular figure at Leicester, who have become a regular presence in the top half of the Premier League under his ownership.

The helicopter was due to fly to Luton Airport, from where Vichai was going to take his private jet to Thailand.

The Thai businessman helped Leicester return to the top flight of English football in 2014 and he became part of the club’s folklore when his backing helped Leicester win their first ever Premier League title in 2016.

Vichai began his business journey by opening a duty free shop in Bangkok in 1989. His retail company, King Power, grew to prominence in Thailand and he is ranked as the fifth richest person in the country, with an empire worth £3.8bn.

He extended his influence in European football when he bought Belgian club OH Leuven in May 2017. The club reside in the Belgian second division.