The incident happened just after midnight on July 19 in the 800 block of Larrabee Street.
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According to investigators, the victim was walking on the sidewalk when a black SUV stopped in front of him.
Three suspects armed with handguns and a rifle got out of the SUV, pushed the victim against a fence, and took his cell phone and wallet.
Video released by the sheriff's department shows the men pointing their weapons at the victim as they dig through his pockets.
At one point, they knock the victim to the ground. Moments later, all three suspects take off running.
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It's unclear if the victim was seriously injured.
This comes after robbers recently targeted a restaurant in West Hollywood, sending tables flying and diners running for safety. Plus, there was another robbery outside of La Boheme bistro in which a suspect was also carrying a rifle.
Detectives say they're working to see if any of the cases are connected.
Meanwhile, residents are left stunned by the violent attack.
"It's pretty brutal," said Braedon Brawer. "I've seen some really big people get jumped too, and if they're willing to go after those kind of people, they're going to target anyone."
Anyone with information is urged to contact Detective Candice Gonzales with the West Hollywood Sheriff's Station at 310-358-4011.