WHITTIER (CBSLA) — A Union Pacific train has derailed Wednesday in Los Nietos, near Whittier, damaging Amtrak and Metrolink tracks under the Slauson Boulevard overpass.

The train derailment happened at about 10:45 a.m. Wednesday.

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No injuries have been reported. But due to an apparent chemical spill, the Slauson Avenue offramp from the 605 Freeway is being closed until at least 4 p.m., according to the California Highway Patrol.

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Afternoon commutes will be affected, with Amtrak saying they have no estimated time of tracks reopening between Fullerton and Los Angeles.

Passengers will be diverted to buses.

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This is a breaking news report. More information will be added as it comes in.