Four people have been injured in a two-vehicle collision near the eastern Nebraska village of Waterloo, and officials say slick road conditions may have contributed to the crash.

Douglas County Chief Deputy Sheriff Marty Bilek says the crash happened around 5 p.m. Wednesday on a bridge near West Maple Road and Highway 275. He says sleet was falling at the time and icy conditions had been reported.

One person is critically injured and three others are seriously injured. An infant in one of the cars was not hurt.

Bilek says a northbound vehicle crossed the center line and hit the other car. Southbound lanes of Highway 275 were closed following the crash.