SAN RAMON (CBS SF) — Speed appears to have played a role in a collision that injured four people — three of them seriously — Sunday afternoon in San Ramon, police said.

Officers were sent at 2:51 p.m. to Alcosta Boulevard and Old Ranch Road where two vehicles collided, Cpl. Mike Pistello said.

The occupant of one vehicle was taken by helicopter to a hospital and three others were transported to hospitals by ambulance.

The damage to both vehicles was extensive.

Pistello said it does not appear that alcohol played a part in the collision but speed likely did based on the damage to the vehicles.

Police initially said that Alcosta Boulevard was closed between Stagecoach Road and Olympia Fields Drive but now say that was incorrect.

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