ST. LOUIS COUNTY, Mo. (KMOV) -- Authorities responded to the scene of a five-vehicle wreck on Highway 40 in west St. Louis County on Monday.
It happened on eastbound Highway 40 at Mason Rd. around 1:50 p.m.
It is still unknown whether anybody was injured in the wreck.
Traffic on Highway 40 was at a standstill while crews worked to clean up the scene.
The cause of the wreck was not immediately clear.
We'll have additional information as soon as it becomes available.