FREMONT (KRON) — At least one person was sent to the hospital after an accident on northbound I-680 in Fremont involving multiple cars Tuesday morning.

The accident occurred on NB I-680 at Auto Mall Parkway around 5:30 a.m., according to officials.

The first car spun off the roadway and crashed. A man pulled over to help but was then hit by another car that lost control and flipped over the first car, hitting the man.

The victim was taken to the hospital with injuries unknown.

All lanes of I-680 are open but traffic is backed up going through Fremont.

Officials believe wet roadways were the main cause of the accident.

Stay with KRON 4 News for updates on this story.