PORTLAND, Ore. — A man was critically injured when he fell off an e-scooter while riding over railroad tracks in Northwest Portland, police said.

The crash happened around 4 p.m. Saturday near Northwest Naito Parkway and Northwest 9th Avenue. A citizen flagged down an officer in the area and said an injured e-scooter rider needed help.

The officer found a 65-year-old man, who was unconscious and not breathing. He performed CPR on the man until paramedics arrived and took the injured man to the hospital.

Police said he's in critical condition. 

The rider was operating a Spin e-scooter and was not wearing a helmet, police said. The man isn't being identified at this time.

RELATED: Bicyclist injured in collision with e-scooter rider Saturday in downtown Portland (video)

RELATED: Nearly half of e-scooter crashes result in head injury, says CDC study done in Austin, Texas

RELATED VIDEO: Many e-scooter riders not wearing helmets (Aug. 2018)

E-SCOOTER LAWS

According to Portland police, e-scooter riders are considered "Motor Assisted Scooters" under Oregon law and the following regulations apply to them:

Don't ride on the sidewalk: Using an electric scooter on the sidewalk and in crosswalks is not allowed. E-scooters aren't allowed to be operated in city parks. People using e-scooters are allowed on Portland city streets and in bike lanes.

Wear a helmet: People using e-scooters are required to wear a bicycle helmet.

Age restrictions: Anyone under the age of 16 is not allowed to ride e-scooters.

Yield to pedestrians: People using e-scooters are required to yield to pedestrians.

Rules and regulations for e-scooter riders