UPDATE: The westbound lanes are again open to traffic.

Traffic was backed up Friday night after a fatal crash shut down the westbound lanes of the Poplar Street Bridge.

The incident occurred around 9:50 p.m. and involved multiple vehicles, according to reports from the St. Louis Metropolitan Police Department. 

Few details were immediately available while accident reconstruction crews completed their investigation.

The St. Louis Fire Department said in a tweet both St. Louis and Illinois State police were on the scene Friday night.