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After locating a suspect vehicle in the area, officers began actively searching for the suspect, with help from police K-9s and a California Highway Patrol Helicopter.
The person is suspected of fatally shooting a woman at about 1:30 p.m. in the 1900 block of First Avenue, near the Lindsay Wildlife Experience, according to police.
VIDEO: Police say Fresno suspect stated "I did it, I shot them"
When officers arrived, they found the victim suffering from at least one gunshot wound and began providing "life saving measures," but she died at the scene, police said.
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Several buildings near the crime scene have been placed on lockdown as a precaution.
The victim has not been identified and a description of the suspect was not immediately available.
If anyone has information regarding this crime please call Walnut Creek Police Department immediately at 925-935-6400
The Bay City News contributed to this article.