Matt Brown allegedly attacked, assailant captured after melee (VIDEO)

Matt Brown fell victim to an alleged attack early Sunday when he was sucker punched in a hotel before the alleged assailant was captured outside the building in Curitiba, Brazil.

The aftermath of the incident -- with Brown in Brazil for Saturday's UFC 198 -- was caught on film, and the alleged assailant was identified by Brown's wife and others as Brown's former jiu-jitsu coach Rodrigo Botti. Brown's current coach Leister Bowling from the Elevation Fight Team in Denver also identified Botti after speaking to UFC commentator Brian Stann.

Had nothing to do w/ Brazil, old grudge, no one knew until all ended @LeisterBowling explained it https://t.co/1CkpJhboKJ

— Brian Stann (@BrianStann) May 15, 2016

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Sources told FOX Sports that Brown was checking out of his hotel when Botti ran into the lobby and attacked the UFC welterweight before running back out again.

Random fan runs into hotel, hits Matt Brown, and runs. Matt's friend catches him. Wow

— Brian Stann (@BrianStann) May 15, 2016

Not a random fan. Guess it is a guy who has had a long time grudge w/ Matt, old coach or something, odd. Security has him now

— Brian Stann (@BrianStann) May 15, 2016

Brown's friends gave chase, tackled him outside the hotel and proceeded to toss him to the ground and punch and kick him before authorities could separate both sides.

UFC officials can be seen in the video separating Brown's friend from Botti after he was captured while trying to flee in a cab outside the hotel. UFC officials later issued a statement confirming the incident and revealing that Brown was unharmed during the attack.

"UFC is aware that welterweight contender Matt Brown was allegedly attacked today by a former acquaintance at the UFC 198 host hotel in Curitiba, Brazil. UFC has been in communication with local authorities to gather more information relative to the alleged attack, and is reviewing security measures at the hotel.

"Fortunately, Brown was uninjured in the situation and will return home to the United States later today as planned."

Brown's wife identified the man in the video as Botti, who is a former jiu-jitsu coach and business partner of the UFC fighter's.

In 2015, Botti claimed that Brown had assaulted him after an altercation at the gym they shared together, but no formal charges were filed against the fighter. Brown's wife explained the altercation in her own words on Twitter.

Not a random fan who attacked Matt. It was Rodrigo Botti who is an absolute psycho.

— Colleen Brown (@Mrs_Immortal) May 15, 2016

In Feb 2015 Matt wore wrestling shoes on mats and Botti got pissed..shoved Matt so Matt fought back. Botti called cops like a wimp.

— Colleen Brown (@Mrs_Immortal) May 15, 2016

Brown is expected to return home on Sunday. There's no word whether charges will be filed in Brazil against Botti.