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A hazmat response was issued after a three-car crash caused a section of U.S. Route 2 in Monroe to shut down. Westbound lanes have since reopened, as of 11:45 a.m.

The crash initially occurred around 9:30 a.m. at Fryelands Boulevard, Snohomish Regional Fire confirmed.

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Large crash on HWY 2 west of Fryelands Blvd. Hazmat situation. One person transported ALS to a hospital. HWY closed. Avoid this area.

— Snohomish Regional Fire & Rescue (@SnoRegionalFire)

Washington State Patrol (WSP) said the hazmat crew was called due to a possible leakage from the crash.

“Hazmat is now on scene at the HWY 2 crash doing a full assessment of what spilled and making a game plan to clean up,” Snohomish Fire & Rescue stated. “Tow trucks have been dispatched.”

It’s unclear what spilled, and the eastbound lanes remain closed with no ETA for reopening, Snohomish Fire & Rescue reported on X at 10:30 a.m.

At least one person was seriously injured, as of this reporting. They were transported to a nearby hospital.

What led to the crash has yet to be determined. Drivers have been advised to avoid the area.

This is a developing story, check back for updates

Frank Sumrall is a content editor at MyNorthwest and producer of the Seattle Seahawks podcast, . You can read his stories here and you can email him here.