LOS ANGELES, CA (THECOUNT) — First responders say 13 people are being treated after a multi-vehicle crash involving a bus on the 405 Freeway in North Hills on Sunday.

Fire officials said a bus crashed on the southbound side of the freeway causing more collisions on both sides of the freeway divider.

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All southbound lanes are shut down at Nordhoff Street due to the collision, which happened about 1 p.m., according to the California Highway Patrol.

A total of 13 patients are being evaluated, with four in serious condition, according to preliminary information from fire officials. source

The CHP said a Sigalert is in place for an unknown duration.

The cause of the crash is under investigation.

Developing.