CCTV video in Cajamarca shows a police car suddenly run off the road...knocking down a woman, 2 young daughters...and another pedestrian.
The incident enraged residents...who fought with police, overturned the car and set it afire.
The 4 victims were rushed to hospital.
The 31 year old mother and her 4-year old daughter each had a leg amputated.
The new police officer was reportedly drunk.
Cajamarca has seen many protests recently over a USA company's plans to begin mining there.
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