Authorities got a call of 25 rounds fired on Shields at Glenn just after 11 Sunday night.
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They found three people shot at the Fresno Stop and Shop.
Officers say a 39-year-old man was hit in the ear and suffered a graze wound to the head.
A 29-year-old man was shot in the upper leg, and a 31-year-old woman was also hit the leg and lower back.
All of the victims were taken to the hospital for treatment.
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Officers found shell casings near Glenn Avenue, and one hit a nearby building.
Witnesses say they saw two suspects wearing dark clothing and masks.
Police are still looking for surveillance footage and witnesses.