RIO VISTA (CBS13) — A head-on crash along Highway 160 south of Rio Vista has left two people dead early Tuesday morning, authorities say.

The crash happened a little after 4:30 a.m. between Rio Vista and Antioch, just north of the Antioch Bridge.

Exactly what led up to the crash is unclear, but firefighters say two vehicles were involved in a head-on crash.

Two people have died as a result of the crash, Rio Vista Fire confirms.

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Southbound lanes of Highway 160 in the area are blocked due to the crash. No estimated time of reopening has been given.