TINLEY PARK, Ill. (CBS) — Two people were killed in a crash on I-80 early Sunday morning, Illinois State Police said.

The crash happened just before 4:30 a.m. in the westbound lanes between La Grange Road and Harlem Avenue.

Troopers responded to the scene for the report of a fatal traffic crash involving a semi and a truck-tractor semi-trailer. 

Two people were pronounced dead. The ages and genders of the victims were not released. 

It is unclear what led up to the crash.

Lanes two and three of I-80 westbound were closed. Harlem Avenue to I-80 westbound was also closed.

No further information was immediately available.