DENVER (KDVR) — Interstate 70 and U.S. 40 are closed in both directions west of the Denver metro area Wednesday morning due to a semitrailer leaking "hazardous materials."

According to the Jefferson County Sheriff's Office in an 8:15 a.m. X post, both the interstate and the highway are closed between the Morrison exit to the Lookout Mountain exit.

The semitrailer was headed westbound when the leak started.

The sheriff's office said hazmat crews are responding and the Colorado State Patrol is leading the response.

The office advised people to avoid the area and said its unclear how long the roads will be closed.

The sheriff's office did not say what kind of material was leaking.

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