The person of interest in the Charlie Kirk assassination walked by several neighborhood cameras -- as the FBI said -- and TMZ has video that appears to show him walking toward the Utah campus where Kirk was shot ... while concealing his weapon.

TMZ obtained chilling video that shows a man dressed in all black matching the description of the FBI's person of interest hobbling down a residential street Wednesday in Orem, Utah at 11:49 AM ... heading toward the Utah Valley University campus just a couple of blocks away.

Remember, the FBI has said the individual arrived on campus at 11:52 AM. TMZ.com

It's interesting that the man is hobbling ... law enforcement says they recovered a bolt-action rifle -- a Mauser .30-06 -- at the scene, and it looks like he may have the rifle hidden un

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