Officers with the Oxnard Police Department were sent to a home in the 1300 block of South C Street where they found the boy with multiple gunshot wounds.
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Police said the boy was rushed to the Ventura County Medical Center where he later died.
The 14-year-old's identity was not immediately released and it's unclear if the boy was targeted.
Anyone with information is urged to contact Det. Kaya Boysan 805-385-7645.