A man riding an e-scooter in Northeast Portland was injured after a collision with a TriMet bus Thursday, authorities say.

The crash occurred while the rider and bus were traveling along Northeast Grand Avenue. An investigation is ongoing to determine how the collision happened, said Sgt. Chris Burley, a Portland police spokesman.

The man took private transportation to a medical center for treatment, Burley said. Portland Fire & Rescue said the e-scooter rider, who is in his mid-20s, suffered an injury to his arm.

No citations have been, according to Burley, and no one on the bus was hurt.

Andrew Theen of The Oregonian/OregonLive staff contributed to this report.

-- Everton Bailey Jr.

ebailey@oregonian.com

503-221-8343; @EvertonBailey