Just before 1:00 pm Sunday, a subject reportedly drive up the Antioch bridge before stopping, getting out of their vehicle and jumped off the bridge.
According to a witness, the male got out of the vehicle and jumped without any hesitation.
With multiple agencies doing training across the San Francisco Bay, Pittsburg Police and AMR were the first to respond in the water as they had a boat and crew on standby due to the Pittsburg Seafood and Music Festival and were on scene in under 5-minutes where the jump occurred and could not locate the subject.
The body was not located Sunday.
Traffic was backed up in both directions as CHP was investigating. No further information has been released.