A man was arrested after he pulled over to help his girlfriend who was involved in a chain-reaction crash in northwest Houston.

Traffic was slowing on Highway 290 near North Gessner Road around 10:45 p.m. Sunday night.

Houston police said a driver did not notice the slowing traffic and she slammed into the back of a car, sending it into another car.

The driver who caused the crash was injured and transported to a hospital.

Her boyfriend, who was in a separate car, stopped to check on her. Police said they suspected he was under the influence of drugs or alcohol, so he was arrested.

No one else was hurt.