The accident in Philadelphia occurred shortly after 8 p.m. Monday.
Authorities say the 16-year-old boy stole the vehicle from a convenience store when the driver left it running while she went into the business. They say the boy eventually ran a red light and struck the other two vehicles.
The crash was witnessed by two police officers who were responding to a double shooting.
Authorities say the teen suffered minor injuries, as did a 24-year-old man driving one of the other vehicles and the man's 19-year-old male passenger. All three were treated at a hospital.
The driver in the third car wasn't hurt.
The teen is facing numerous charges.
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