Stone's father Brian said: 'This world is not short of idiots'

They have insisted the brawl was not terrorist-related

Cops are still searching for two Asian men in connection to the attack

Video released by police shows suspects getting into a car moments later

Footage of the incident shows him fighting off a group of three men

Chilling footage has emerged of suspects jogging away from the scene and getting into a car moments after French-terror train hero Spencer Stone was stabbed.

Police are still searching for two Asian men after the hero U.S. airman was knifed during a fight on a night out with friends in Sacramento.

The 23 year old, who foiled a potential terrorist attack in August, was stabbed 'four times in the chest' shortly after 12.45am on Thursday after leaving a gay bar with friends.

He suffered a collapsed lung and is being treated in an intensive care unit - but is expected to survive. A 24-year-old woman also suffered minor injuries during the confrontation.

The new video shows the men approaching a vehicle that pulled up on the street. The pair then get in before the car drives off.

Chilling footage has emerged of suspects jogging away from the scene and getting into a car moments after French-terror train hero Spencer Stone was stabbed

They are seen fleeing the scene and then getting into a vehicle that pulled up. Police are searching for two Asian men in connection with the attack

The two men were allegedly involved in the brawl are seen approaching the back of the car before getting in

Footage of the brawl shows Stone (believed to be the man circled in red) fighting off a group of men on his own

The 23-year-old U.S. airman 1st class was one of the three Americans who took down a gunman as he opened fire on a Paris train in August (l to r: U.S. Army Specialist Alek Skarlatos, Airman 1st Class Spencer Stone, and Anthony Sadler

The 23-year-old U.S. airman 1st class was one of the three Americans who managed to take down a gunman as he opened fire on a Paris-bound train this past August - and nearly had his thumb severed from his hand with a box cutter during that incident.

His father Brian Stone told People magazine: 'He's out of surgery and doing well. He's been upgraded so no longer critical and it looks like he's going to be okay. All I can say is that this world is not short of idiots.'

A shocking clip of the brawl shows Stone fighting off a group of three men on his own and lunging at them while others attempt to break them up.

An attacker then appears to pull out a sharp instrument and stab Stone. His shirt appears to turn a dark shade of red as he stumbles away and his attackers disperse from the scene.

A source told the Sacramento Bee that Stone was with three female friends and one male friend and had just left the gay bar Badlands when the attack occurred.

Police are now looking for two adult Asian males who fled in a dark Toyota Camry. In a news conference on Thursday they repeatedly stressed that the incident was not a terrorist act or a hate crime.

Cops have said the attack was not terrorist related and may have been caused by alcohol.

Stone was taken to the UC Davis Medical Center where he is being treated for the serious injuries he received during the assault.

The stabbing happened at 12.45am at the intersection of 21st and K in the city and the crime was so violent that two blocks of the street were shut down.

Initially police did not believe that Stone would be able to survive his injuries.

Stone appeared to be fighting with the two other men in white shirts (above the moment Stone appears to be stabbed)

Police are now searching for two Asian male suspects who fled the scene (above)

Detectives leave the gay club Badlands on Thursday afternoon (above) where they spoke with staff

Stone was in a sling just last month from the injury he suffered during the August attack, and may have still had on his brace to protect his thumb.

'It is believed that the victim was out with a group of friends when a physical altercation led to the victim being stabbed multiple times in his upper body,' police said in a statement.

'Detectives were called to the scene to assist with the investigation and the victim is currently being treated for what appears to be non-life threatening injuries.'

A man and woman were questioned by police after the attack, but it is not known if they were taken into custody.

No one else involved in the melee suffered any injuries.

A Badlands employee told the Los Angeles Times that Stone left about 45 minutes before the fight started, though it is not known where he went at that time.

Detectives were seen at the club - which bills itself as 'Sacramento’s Premier Gay Nightclub' on their website - Thursday afternoon speaking with staff inside.

The club was hosting their weekly EDM, Trap, Bass, and Dubstep night on Wednesday, which features $1 well drinks from 11PM to midnight, just before the incident occurred.

It is not known if Stone was drinking on Wednesday night.

'The assault does not appear to be a random act,' said Sacramento deputy police chief Ken Bernard during a press conference Thursday morning.

'It’s believed to be related to a nightclub incident.

'There was a dispute that led to the altercation. There was conversations and then it continued down the block to where the stabbing occurred.'

Authorities said they have still been unable to speak to Stone.

Stone’s cousin, Paige, 22, told DailyMail.com: ‘I talked to my dad on the phone and Spencer is going to be okay. They didn't know if he'd survive at first, but he will be okay. Still waiting on more details from my aunt.

‘He has an incredible faith and I really think God played a huge part in his recovery. He has gone through so much, yet still survives these traumatic experiences.’

She said Stone is due to undergo emergency surgery.

‘I’m not sure if he’s awake,’ she added.

His parents also released a satement saying: 'The family of Airman Spencer Stone appreciates the outpouring of love and support. Airman Stone is in serious condition. His family requests that the media respect his right to privacy at this time.'

Alex Skarlatos, who tweeted his support to friend Stone in the wake of the attack, is seen arriving for a Dancing with the Stars rehearsal in West Hollywood

Large blood spots could still be seen on the scene Thursday morning along with a teddy bear (above)

Stone (above in August) was still wearing a sling last month from the injury he suffered in August

Stone was taken to the UC Davis Medical Center where he is being treated for the injuries he received in the attack

Badlands was hosting their weekly EDM, Trap, Bass, and Dubstep night on Wednesday (above), which features $1 well drinks from 11p, to midnight, just before the incident occurred

In the French train attack, Stone was stabbed with a box cutter when he, along with childhood friends Alek Skarlatos and Anthony Sadler, took down Morocco-born Ayooub El-Khazaani after he opened fire in August on a train bound for Paris.

He had to undergo surgery to reattach part of his hand after the incident.

Stone was the first of the three to reach the man after he was awakened by the sound of gunfire and managed to take him down - saving countless lives thanks to his heroics.

Even after his thumb had been almost completely severed by El-Khazaani, he still began to treat others who were injured on the train.

'He seemed like he was willing to fight to the end - so were we,' Stone said of the gunman after the attack in an interview with NBC.

Only a few weeks ago, President Barack Obama met Stone and praised him alongside Skarlatos and Sadler for their teamwork, courage and quick-thinking actions that averted 'a real calamity'.

Obama said Stone was 'making real progress' and intends to pursue work in medicine.

Stone also went to the Pentagon and was awarded the prestigious Airman's Medal and a Purple Heart.

They previously had been awarded France's highest honor - the Legion d'Honneur - by President Francois Hollande.

Skarlatos tweeted his support to the Stone family on Thursday, writing: 'Everybody send prayers out to the Stone family today.'

He also said that his friend is 'one tough guy'.

The three friends all grew up near Sacramento, and the city held a parade for them on September 11 to honor their courageous act.

Stone is assigned to the Travis Air Force Base which is just outside Sacramento, and grew up in nearby Carmichael.

'My thoughts and prayers go out to Spencer Stone and the Stone family. I ask that everyone respect the family's privacy at this time,' said Mayor Kevin Johnson.