A small airplane landed on Interstate 355 near Lockport Thursday morning, blocking lanes of traffic on the tollway and leaving the pilot and three passengers injured, authorities said.
The incident happened around 11:30 a.m. near U.S. Route 6.
According to authorities a small, white BeechB24R aircraft made an emergency landing in the southbound lanes after experiencing "an unknown engine problem," according to Illinois State Police.
Authorities say that when the plane landed, it suffered damage to its front end and to the left wing of the aircraft.
The pilot, a 39-year-old man, and three passengers, including a 15-year-old girl, were injured and were taken to area hospitals with non-life-threatening injuries.
Lanes on the highway were blocked between 167th Street and before Cedar Road. One lane on the northbound side was also blocked. Those lanes reopened at approximately 3:30 p.m.
The Federal Aviation Administration was notified of the incident, and an investigation remains underway.