PACIFICA, Calif. (KRON) – A severe traffic alert has been issued on northbound Highway 1 in Pacifica following a collision.

The collision happened north of Devil’s Slide Trail blocking all lanes.

As of 8:45 p.m., a lane remains blocked and one-way traffic control is in effect.

According to 511 SF Bay, there were injuries reported. It is unclear how many people were injured.

At this time, there is no estimated time for reopening the lanes.

Drivers are advised to use alternate routes.

Check back for updates as this is developing.