FREMONT, Neb. (AP) — Authorities are investigating a weekend crash in foggy conditions near Fremont that killed a pregnant mom and her three sons.

The three-vehicle crash happened Saturday evening just west of Fremont on U.S. Highway 30.

At the entrance to Westlake Mobile Home on Highway 30, a Dodge pickup struck a Ford Mustang that was stopped and waiting turn. After that impact, the truck veered into oncoming traffic and stuck the Ford Taurus the mother was driving.

Authorities say the 32-year-old mom and sons aged 7, 8, and 10 all died. The family is from Schyler, Neb.

The drivers and occupants of the other two vehicles were also injured, but they are expected to survive.