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Matt York, Associated Press
A makeshift memorial on a tree is shown, Thursday, Aug. 29, 2013, in Phoenix. An 8-year-old boy was driving his mother's car on a nighttime joyride with his 6-year-old sister when it crashed into a telephone pole, behind the tree, fatally injuring the girl, police said Thursday.

PHOENIX — Recording of 911 calls released by Phoenix police show a witness followed a car driven by a little boy for more than 10 minutes before it crashed and killed the boy's little sister.

At about the same time, the children's frantic mother called 911 to report someone had taken her two older children and her car was gone. The sobbing mom is heard begging for help from neighbors and then discovering her spare key is missing.

The calls released Friday document a tragic joyride up and down a main Phoenix road by an 8-year-old boy that ended when he swerved and hit a power pole. He was slightly hurt but 6-year-old Aaliyah Felder was killed.