Roseburg police are trying to identify a group of juveniles that were filmed attacking three homeless men on Monday evening.

Sgt. Gary Klopfenstein of the Roseburg Police Department said over the phone Tuesday that his department is working with school resource officers and getting tips from the public to help identify the group of youths who appear in an Instagram video punching, kicking and wrestling the three men.

The video shows roughly a dozen people ganging up on the three, chasing them down a trail and then continuing to punch and kick one man after he falls to the ground.

The video was posted to Instagram by a user called "iam_the_greatest_" and then shared to Facebook. According to the Roseburg News-Review, the "iam_the_greatest_" Instagram account "posts videos of juveniles fighting in various locations around Douglas County, including under the Interstate 5 bridge near Roseburg High School."

Klopfenstein said they aren't sure yet how many juveniles were involved in the attack but that he expects between five and seven juveniles will be charged.

"One juvenile called his juvenile probation officer and disclosed he was involved," Klopfenstein told us. "That juvenile was arrested and lodged at the Douglas County Juvenile Detention Center by his probation officer, for probation violation."

He has not yet been charged in the attack.

Klopfenstein said that if the men sustained any injuries, the juveniles could be charged with felony assault three. If there are no injuries, they could be charged with harassment.

As of now, Klopfenstein isn't aware of any injuries.

Jon William Beck

According to the patrol log, the incident started at Micelli Park in Roseburg when a 15-year-old girl started harassing a transient man at his camp at the park. The man, later arrested and identified as Jon William Beck, 38, threatened the young woman with his machete. Another person shoved the teenager.

The report says that the girl left the camp and then returned with "a mob of angry juveniles" who attacked Beck while someone filmed the incident.

Beck was arrested for a parole violation and menacing. He's currently lodged at Douglas County Jail.

Anyone with information in this case can call the Roseburg Police Department's tip line at 541-492-6794, or send an email to rpdpio@cityofroseburg.org.

You can watch the video below. Warning: Contains graphic violence and language.

-- Lizzy Acker

503-221-8052

lacker@oregonian.com, @lizzzyacker