The man can be heard yelling at the group to "back off" and then puts the rifle back in the truck.
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That's when a scuffle breaks out between some of the protesters in the middle of the road.
Upland police said on Monday night that they were able to find and arrest the man who pulled the gun.
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LAPD officers take a knee to show solidarity with protesters
LAPD officers take a knee to show solidarity with protesters