A 15-year-old was arrested by Portland Police Bureau after suspect demanded phone in Harrison Park.

PPB PHOTO - Portland police say a robbery suspect displayed a loaded semiautomatic handgun in Harrison Park on July 13.The Portland Police Bureau has arrested a teenage juvenile for allegedly committing armed robbery in a park in the Montavilla neighborhood.

East Precinct officers responded to calls reporting a "robbery at gunpoint" in Harrison Park, 8300 S.E. Stephens St., around 11:34 a.m. on Saturday, July 13, according to a news release.

Police say a suspect was located and detained near Clinton Street and Southeast 84th Avenue.

"Officers developed probable cause to arrest the suspect and they located a loaded semiautomatic handgun believed to have been used in the robbery," police say.

Authorities claim the suspect, a 15-year-old male teen, approached a victim who was sitting in the park. The 15-year-old is alleged to have displayed the handgun and tried to take the victim's phone. The struggle ended with the 15-year-old running away.

No injuries were reported.

Police say the juvenile was booked into the Multnomah County Juvenile Detention Center on charges of first-degree robbery, unlawful possession of a firearm and menacing.

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