ST. LOUIS COUNTY, Mo. – There’s a major police presence at Interstate 70 and Hanley Road in north St. Louis County.

Traffic backed up considerably in both directions of I-70 as crews work to investigate the matter. Some drivers are being detoured as authorities investigate the scene.

Officials reported a three-vehicle crash around 3:30 p.m. in the area. Specific details around the crash have not yet been disclosed. FOX 2 has heard unconfirmed reports that there may have been a shooting after the crash, though police have not yet disclosed that.

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MoDOT tells FOX 2 all lanes are blocked as of 4 p.m. Drivers are encouraged to use alternate routes if possible.

This is a developing story. We will update as more information becomes available.