An FBI search warrant recently unsealed reveals that agents quickly amassed evidence of Wade Michael Page's connections to white power groups, the Milwaukee Journal Sentinel reported Tuesday.
The search warrant was filed days after the shootings at Sikh Temple of Wisconsin in Oak Creek so agents could search Page's computers and social media sites.
As a result, the FBI learned that Page used the Internet to grow increasingly radical in his white supremacist views in the months leading up to the mass shooting.
After shooting worshippers, Page left the temple and exchanged gunfire with two Oak Creek police officers, seriously wounding one of them before being shot by the other officer.
Page then put his weapon to his head and fired what turned out to be a fatal shot.
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