( CNN ) -- Seven relatives died when their SUV was crushed between two big rigs during a traffic backup in Indiana , leaving the vehicle in a burning , mangled heap . The victims in the Jasper County crash included four children , the Indiana State Police said . Preliminary reports indicate the accident Thursday night occurred when the Jeep stopped behind a tractor-trailer near a work zone . A tractor-trailer behind the Jeep failed to stop , rear-ending it and sending it plowing into the semi in front . The Jeep exploded into flames , which also spread to the two trucks . After firefighters extinguished the flames , they found two bodies in the Jeep . But the car was so severely burned and mangled , fire crews took it to the Keener Township Fire Department to remove the victims . It took them hours to take it apart , and they then discovered five more bodies , authorities said . `` There were a total of three adults and four children found inside the vehicle , '' the Indiana State Police said in a statement . CNN affiliate WLS said they were all family members , but did not specify how they are related to one another . An investigation is under way , but alcohol and narcotics are not believed to be factors , authorities said . Police identified the dead as Indiana residents Lindsey Williams , 27 ; Arielle Goldman , 3 ; Yazmin Goldman , 5 ; Amado Mangual , 49 ; and Atlanta residents Jamin Osborne , 5 ; Jasmin Osborne , 7 ; and Yvette Williams , 35 . One of the truck drivers was hospitalized while the other one was unhurt . In 2012 : Drivers did n't slow before fiery multi-car crash . CNN 's Jake Carpenter contributed to this report .
All four children were under age 8 . A semi rear-ended the Jeep , sending it plowing into a big rig in front of it . The accident occurred during a traffic backup in Indiana .