According to police, the man was live streaming on social media and discussed "shooting up" the Westfield Valley Fair Mall in San Jose.
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Police were notified around 4 p.m. Wednesday.
Police said the male suspect had a "distinct" appearance and a "loud" hair color.
Officers found the man at the mall on Stevens Creek Boulevard in San Jose and said he was armed with a weapon
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No one at the mall was hurt.
Police have not identified the suspect or have not disclosed the charges he's facing.
San Jose police say they received a tip from the Santa Cruz County Sheriff's Office, who told them about the man making threats on Snapchat.
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