ST. LOUIS COUNTY, Mo. — Westbound lanes on Interstate 70 past Hanley Road closed around 4 p.m. Tuesday due to a three-vehicle crash, according to the Missouri Department of Transportation.

MoDOT traffic cameras showed extensive back up to Kingshighway Blvd for roughly two and a half hours.

MoDOT then notified via Twitter that emergency vehicles were cleared by 6:30 p.m.

The cause of the crash has not yet been disclosed.

This is a developing story and it will be updated as more information becomes available.