Multiple emergency crews were on the scene of a major wreck on Interstate 55 in south St. Louis County

Multiple emergency crews were on the scene of a major wreck on Interstate 55 in south St. Louis County Thursday morning.

The wreck happened on northbound I-55 near Butler Hill Rd. around 10 a.m.
The Missouri Highway Patrol told News 4 all but one northbound lane was closed while crews worked to clear the scene. All lanes have since re-opened.

It was not immediately known if anyone was injured.