A man was arrested and a United Airlines employee lay bloodied on the ground after the pair traded punches at Newark's Liberty International Airport.

Footage of the fight went viral after it was released Sunday, and the passenger has claimed that his demolition of the worker was done in self-defense, according to local authorities.

It is unclear who started the altercation, but it seemed to begin after the passenger, identified by TMZ as ex-NFL player Brendan Langley, sought to use a wheelchair to transport his luggage in an apparent effort to avoid paying for luggage carts, according to a report.

The footage of the fight picks up midway through the brawl, but witnesses said the altercation began with pushing and slapping after an argument between the two men got out of hand.

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Video of the fight begins with the pair pushing, slapping, and exchanging words.

The United Airlines worker came out from behind the counter and managed to dodge the passenger's first swing before throwing a shot in return, according to the video, which has been seen by millions on Twitter.

However, the employee kept his hands low and suffered a barrage of blows that sent him toppling over the baggage scale.

Bloodied, he returned to his feet and approached the passenger again.

"You want more?" Langley said, according to the footage. "He wants more."

The altercation ended when other airport employees stepped in.

Langley was arrested on an assault charge but claimed that he acted after he was assaulted, according to a report.

"United Airlines does not tolerate violence of any kind at our airports or on board our planes and we are working with local authorities to further investigate this matter," a statement from United Airlines reads.

The employee has reportedly been fired by the airline.

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The Washington Examiner reached out to United Airlines for comment but did not receive a response.