It happened June 2 during civil unrest across the city. Officers were responding to a massive protest in Hollywood where demonstrators had taken over an intersection.
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Ben Montemayor, 28, posted on Instagram about the intense encounter, which he says left him severely injured requiring emergency surgery.
In the video released by the LAPD, you can see officers in riot gear move in to take control of the intersection. Montemayor is holding a sign. With his hands up, an officer yanks the sign away. The 28-year-old backs up as another officer fires the non-lethal round striking him in the groin.
Less lethal rounds are meant to prevent serious injuries but critics say the department's use has left many with substantial wounds.
The LAPD is launching its investigation after Montemayor's social media post and a report by the LA Times.
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The department says it has not been able to interview Montemayor who has referred authorities to his attorney.
The LAPD says the investigation will likely take several months.
The findings ultimately were forwarded to the chief to determine any action.
Video shows LAPD mow down man who had hands up amid protest in Downtown Los Angeles
Video shows police knock down man amid protest in Downtown Los Angeles