Investigators are still working to identify four people killed in a traffic accident in Ellsworth County on Tuesday.

Patrol trooper Ben Gardner said Wednesday the victims are believed to be from Colorado and authorities in that state are helping to obtain identities.

Gardner says the victims’ SUV hit a semi-trailer truck that parked along Interstate 70 about eight miles north of Ellsworth after experiencing mechanical problems.

Gardner says two people rescued a child, believed to be between 5 and 8 years old, from the vehicle. The child is hospitalized in Wichita but investigators have not been able to talk to him yet.

He says the extent of the damage prevented emergency personnel from positively determining the ages or genders of the people in the vehicle. The truck driver wasn’t injured.