ANTONIO BROWN HANDCUFFED IN FLORIDA AFTER BRAWL ... They Tried To Rob Me!

GQ

7:35 AM PT -- Miami police tell TMZ they received a call around 3 AM in the area of NE 2nd Avenue and 67th Street, where they initiated an investigation ... which included canvassing the area and interviewing several individuals.

No arrests were made and no injured persons were located at the scene in connection with the call. The investigation is ongoing.

Antonio Brown had a wild Friday night -- walking out of Adin Ross' Brand Risk kickboxing event Friday night in handcuffs after a serious brawl ... and we have it on video.

Check it out ... the NFL star gets into a serious scuffle with several people outside the Miami, Florida venue. The video shows him being aggressively pulled to the ground ... after which he gets up and kicks the individual who tackled him before trying to escape the chaos.

Another video shows the beginning of the brawl ... AB takes several punches after getting into it with one individual. Others join in, and the rowdy altercation sends his hat, sunglasses and more flying to the ground.

Next thing we know ... he's being walked to a police vehicle in handcuffs.

He wasn't detained for long -- a source tells TMZ he was carted away by officers but returned to the venue about 20 minutes later as a free man."

 Antonio corroborates that detail with a tweet he shared following the incident, claiming he was not arrested and just temporarily detained while officers received his side of the story.

He claims he was jumped by "multiple individuals" who tried to rob him of his jewelry and cause him "physical harm." He says he will be taking legal action against the alleged perpetrators.

AB did not mention the two gunshots heard in several angles of the altercation circulating on social media. Several reports allege he is the one who fired off the gun in self-defense -- and in one video, a person behind the camera tells a responding officer he has a gun.