SAN MATEO (KRON) — One westbound lane is blocked on the San Mateo Bridge due to a collision, according to the California Highway Patrol.

The collision was first reported at 4:43 a.m. and involves at least four vehicles.

The collision is in the westbound lanes, about mid-span just before the High Rise, CHP officials said.

A traffic alert was issued at 5:11 a.m. because one lane was closed.

One tow truck is on scene. Another is en route to aid in clearing the scene.

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