Tributes have been pouring in after the deaths of two firefighters and a 57-year-old man in a fire at an Oxfordshire business park.

Firefighters Jennie Logan, 30, and Martyn Sadler, 38, died in the fire at Bicester Motion on Thursday. Father-of-two David Chester, who worked at the site, was also killed. Two firefighters remain seriously injured in hospital.

Sherine Wheeler, of the Fire Fighter’s Charity, told BBC Radio 4’s Today programme it was “a powerful reminder of the courage and sacrifices shown by firefighters every day”.

Both Ms Logan and Mr Sadler were involved with the women’s team at Bicester Rugby Union Football Club, which said “their presence at the club will be massively missed”.

“Our hearts and deepest condolences go out to their families, friends and our members at this terrible time,” the club added.

The Fire Brigades Union also offered its condolences. General secretary Steve Wright said: “Jennie and Martyn died in the line of duty protecting their community.

“They were both well-loved and widely respected. We are proud that they were members of our union.

“We also send our condolences to the family and friends of David Chester.

“Two FBU members who attended the incident are still in hospital. Our thoughts are with them and their loved ones.

“The FBU will be conducting a full investigation of the incident which led to these tragic circumstances.

“For now, we are grieving for our fallen colleagues and friends.”

Many floral tributes have also been left at Bicester fire station.

People are now being asked to lay flowers in the town’s Garth Park, with a book of condolence set to open at Garth House in the park from Monday.

Shortly before midday on Saturday, the fire was brought “under control” with “no visible flames”, said Oxfordshire County Council, which runs the fire service in the county.

“However, there are small pockets of smoke and heat so our fire crews remain on site dampening down.”

Among the many tributes left at the scene was a message from Thames Valley Police, which read: “To my Red Light Family, in memory of two heroes.

“With deepest sympathy and heartfelt condolences to family and friends. Always in our thoughts, your Blue Light Family (TVP).”

A golden plaque has also been placed underneath the Bicester Motion sign at the entrance to the site.

The tribute reads: “Oxfordshire Fire and Rescue Service. Bicester Motion. Our thoughts and prayers go out to all of those affected by the sad loss of two firefighters and the member of the public. Love from the Bicester community.”

It is surrounded by flowers and handwritten messages left in tribute by members of the public.

Pam Stiddig, who lives near Bicester Motion and saw the fire from her home, visited Garth Park to lay flowers and pay her respects.

She said: “I’ve come because they are our local heroes. It’s very, very sad.”

Clara Williams, who has lived in the town all her life, said: “I can’t even process what happened.”

Oxford City Council has lowered the city’s flag, flying over Oxford Town Hall, to half-mast in tribute.

St Laurence’s Church in Banbury Road, Caversfield, close to the site, said it had opened its doors “for anyone looking for a space for private prayer or for stillness and reflection” following the “tragic news”.

A book of condolence has also been opened at the church.

Both firefighters worked at Oxfordshire Fire and Rescue Service and Mr Sadler was also part of the London Fire Brigade.

The London Fire Commissioner, Andy Roe, said Mr Sadler “exemplified courage and selflessness” and had been serving on retained duty at Bicester Fire Station.

He was a leading firefighter in Ealing, west London, and an instructor in breathing apparatus and fire behaviour at the Fire Service College.

Ms Wheeler, speaking on the Today programme on Saturday, said the Fire Fighter’s Charity was “heartbroken by what has happened and I would like to extend my condolences to Jennie and Martyn’s families and also Dave Chester’s family and colleagues”.

“Firefighters go to work every day knowing that there are risks but when something like this happens it brings that reality really crashing home,” she said.

“To lose two firefighters has a far-reaching impact across the whole of the fire service community.”

Bicester Motion, home to more than 50 specialist businesses, focused on classic car restoration and engineering on the former site of RAF Bicester.

It was formerly RAF Bomber Command in World War Two and became redundant in 2004.

Paying tribute to “the three lives that have been lost”, Bicester Motion chairman Daniel Geoghegan said the firefighters showcased “the epitome of selfless service” and had “gone above and beyond under unprecedented circumstances”.

Mr Geoghegan added that father-of-two Mr Chester, who ran family business Chesters & Sons, had “a long history with the estate”.

He said Mr Chester was “part of the fabric of our estate and a friend to us all”.

“He joined us 12 years ago when we first bought the site and, with his wife and two sons, has been a pillar of our whole business community.

“Whenever you had a question, you would ‘just ask Dave’, not just him but his whole family as they all cared about this place just as much as we do.

“Our whole community used to say that ‘Dave always had our back’. Yesterday, he was doing just that – the epitome of his selfless spirit,” he added.

The Chesters & Sons company website says its work at Bicester Motion “included carefully unearthing four buried wartime air raid shelters so as not to damage the structures to allow them to be renovated by another contractor”.

The fire was reported at about 18:30 BST on Thursday and rapidly spread through a former aircraft hangar at the site.

At its height, 10 fire crews were tackling the blaze. The cause of the fire is not yet known.

Police have launched an unexplained death investigation, but are not currently treating it as a criminal matter.

Oxfordshire County Council said it recognised that “people may wish to pay their respects to those who have tragically died”.

“We would be grateful if anyone wishes to lay flowers that these are laid in Garth Park, Bicester rather than at fire stations or at Bicester Motion to avoid obstruction to the highways,” it said.

The park, on Launton Road, is set to open from 07:30 to 21:00 BST daily.

From Monday, people can also sign the book of condolence between Monday to Thursday 09:00 to17:00 and Friday 09:00 to 16:00.

At the scene on Friday, Oxfordshire’s Chief Fire Officer Rob MacDougall was visibly emotional and spoke with “a heavy heart” when he confirmed the deaths.

He added: “Our thoughts are with the family friends and colleagues affected during this time.

“I’m immensely proud and grateful for the exemplary multiagency response and the unwavering bravery demonstrated by the emergency services personnel.”

Assistant Chief Constable Tim Metcalfe, of Thames Valley Police, described the deaths as “an absolute tragedy” and said the thoughts of everyone at the force were with the families, friends and colleagues of those who had died.

Officers will remain at the scene for a number of days to ensure the public remain safe.