Border officials are reminding people to keep their weapons at home when entering another country.
The Canada Border Services Agency (CBSA) said 11 brass knuckles and a firearm were seized at the Blue Water Bridge port of entry on April 15.
A photo was posted to social media on Monday.
The CBSA said the individual was trying to enter Canada when enforcement action was taken. The person was issued a penalty and directed back into the U.S.