PORTLAND, Ore. (KOIN) — Seven teens were rounded up and arrested Tuesday afternoon after a man was assaulted on a MAX train, police said.

Officers responded to the Holgate Boulevard Transit Station at about 2 p.m. and found a man with non-life-threatening injuries, according to the Portland Police Bureau.

The assault happened on the Southbound MAX train traveling from the Powell to Holgate transit stations, police said. A knife was displayed during the assault but it wasn’t used to hurt anyone.

Authorities learned several suspects were involved but had fled the scene. Officers surrounded the area and brought in a K9. Seven teens — 6 boys and one girl — were eventually found and arrested.

The youngest suspect is 13 and the oldest is 16, according to police.

Detectives said some of the teens were involved in four other incidents taking place at other transit stations in Portland and Gresham since mid-February.

All of the teens are facing multiple charges including robbery and theft. Many are also facing charges of riot and interfering with public transit. They were booked into the Donald E. Long Juvenile Detention Center.

The investigation is ongoing. Anyone with information about the assault is asked to call 503.823.3333.