As protests against immigration raids grip the Los Angeles area, the FBI is searching for a man who allegedly hurled rocks at federal vehicles.

       Authorities said they've identified the suspect as 40-year-old Compton resident Elpidio Reyna, who is considered a fugitive by the FBI.

       Reyna was allegedly seen on video throwing rocks at law enforcement vehicles during protests in the south LA city of Paramount on Saturday afternoon, injuring a federal officer and damaging government cars, the FBI said.

       "Turn yourself in," FBI Deputy Director Dan Bongino tweeted Tuesday. "It’s only a matter of time."

       The FBI has identified the man #wanted for assaulting a federal officer this weekend as Elpidio Reyna, 40, of Compton, CA. He is considered a fugitive and we continue to seek his location. A #reward of up to $50K is being offered for information leading to his arrest/conviction. pic.twitter.com/WPEE6SIjZp

       The FBI said it's offering a reward up to $50,000 for information leading to Reyna's arrest and conviction. Anyone with information is asked to call 1-800-CALL-FBI.

       Meanwhile, the Trump administration has dispatched 700 Marines to LA and increased the California National Guard presence to 4,000, despite California Gov. Gavin Newsom's objections.

       ABC News' Tristan Maglunog contributed to this report.