DUBLIN, Calif. (AP) — Authorities in Northern California say a patient jumped out of a moving ambulance on a highway and was struck and killed by a passing car.

The California Highway Patrol tells KTVU-TV the unidentified woman was being transported Monday from a medical center in Pleasanton to a psychiatric hospital in San Leandro.

The CHP says the woman got out of her restraints, overpowered a paramedic and jumped out as the ambulance was coming to a stop on a ramp connecting two highways. She was declared dead at the scene.

CHP Officer Josh Roberts says investigators are trying to figure out how the woman was able to jump out.

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Information from: KTVU-TV.