The Saskatoon Police Service (SPS) said airport security found a man in possession of a firearm magazine with ammunition in the pre-screening area on Sunday.
At around 5:13 a.m. CT, officers were called to the John G. Diefenbaker International Airport.
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SPS officials said the man identified himself as an officer from another police agency.
The ammunition was turned over to Saskatoon police and the matter is being looked into.