ST. LOUIS COUNTY, Mo. – A crash has completely blocked southbound Missouri Route 367 just before Dunn as of 7:20 a.m. Wednesday.

Ambulances are on the scene. Traffic is backed up for over one mile. It is unknown at this time what led up to the crash. It is also unknown if anyone was injured.

FOX 2 will continue to update this story with more information as it becomes available.