Tragedy struck Thornton on Saturday evening when a catastrophic vehicular collision claimed the lives of four individuals and left another with grave injuries, as confirmed by the Thornton Police Department via a social media update. The incident, which involved two vehicles, occurred at the junction of Thornton Parkway and Washington Street around 7:30 p.m., resulting in one of the cars igniting into flames following the crash, this sequence of events was reported by both 9NEWS and Denver7.