Sept. 20 (UPI) -- Authorities detained an armed man who was pretending to be affiliated with law enforcement at the location of Sunday's planned memorial for conservative activist Charlie Kirk.

The man has not been identified or officially arrested but was armed when local and U.S. Secret Service agents detained him overnight at State Farm Stadium in Glendale, Ariz., officials confirmed on Saturday.

Officials said the man was "exhibiting suspicious behavior" when he was detained and told police and the Secret Service he was affiliated with law enforcement.

Police confirmed he is not a member of any law enforcement agency and are looking into why he was at that location.

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