COLFAX COUNTY, Neb. -- A two-vehicle accident between Clarkson and Howells sent two teenagers to the hospital via helicopter Wednesday night.

The crash, which involved a semi and a car, occurred at approximately 7:30 p.m., according to the Colfax County Sheriff's Office.

The semi reportedly hit the side of the car at the intersection of Highways 15 and 91. Witnesses say the car stopped at a stop sign before pulling out in front of the semi.

Two teenagers in the car, confirmed to be sisters, were airlifted for medical treatment and were listed in serious-to-critical condition as of early Thursday morning, according to a press release issued by the Colfax County Sheriff's Office. The 47-year-old semi driver did not require medical attention.