경찰은 화물차가 앞서 달리던 승용차의 뒤를 들이받으면서 사고가 시작된 것으로 보고 정확한 경위를 조사하고 있습니다.
The police are investigating the exact circumstances of the accident, as they believe that it started when the truck rear-ended the sedan which was moving in front of the truck.