A six-year-old Phoenix girl has died this week due to injuries sustained from a car crash when her eight-year-old brother crashed the family car into a pole.

The children's mother reported the kids missing at approximately 10 p.m. on Aug. 28, the same time an emergency dispatcher received a call of a moving vehicle with children inside, according to Phoenix police Sgt. Steve Martos.

"It looks like next to me there are these two little kids driving a car," Rudy De La Cruz said to a 911 dispatcher as he followed them in his own vehicle. "They're all over the lanes and not stopping."

A police car spotted a 2010 Hyundai Elantra and followed it before the boy crashed the vehicle into a pole only a block away from the family's house.

The girl was still alive by the time officers got to her, but she died the following morning from her injuries. She was not wearing a seat belt at the time of the crash, and a side air bag did not deploy according to Reuters.

The driver suffered a minor ankle injury.

Police believe the kids drove about five miles and could have been driving home before the crash.

"This is just a horrific event," Martos said, according to Reuters. "The mom puts them to bed, tucks them in for the night and then wakes up this morning and finds that her six-year-old is dead. That's just a tragedy."

Police did not identify the mother, who believed her kids had been kidnapped after discovering the garage door was open and the car was gone.

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