LAKE ST. LOUIS — Four people died Friday when a pickup truck crossed a grassy median and drove into oncoming traffic on Interstate 64 near the town of Lake St. Louis, Missouri.

Cpl. Juston Wheetley of the Missouri Highway Patrol told the St. Louis Post-Dispatch that the accident happened about 11 a.m. when an eastbound pickup crossed into the westbound lanes and struck two cars head-on. Two people died at the scene and two others died at a hospital. One other person remains hospitalized.

Names and ages of the victims have not been released. The survivor's condition wasn't immediately known.

The crash closed the westbound lanes, leading to a lengthy backup.

The median at the scene has a cable barrier designed to protect against crossover accidents, but Wheetley says vehicles sometimes go underneath the cables. He's not sure if that's what happened in this accident.

Lake St. Louis, in St. Charles County, is about 40 miles west of St. Louis.