Justin Bieber's security guards allegedly assaulted a photog in Miami and authorities are investigating ... TMZ has learned.
Bieber was in the parking lot at The Hit Factory, skateboarding in the parking lot. A photog -- the alleged victim -- began taking pics of the singer.
Our sources say the photog told cops ... 2 of Bieber's bodyguards rushed him and one started choking him. He says the bodyguards grabbed his camera and removed the memory card.
The cops showed up and took a battery report. The case will be sent to the State's Attorney for review.
We're told there are photos of the assault -- of course.
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