A Michigan man and teenager were set to be charged Wednesday with driving into a major U.S.-Canada border crossing with a smoke bomb and other weapons in their vehicle, authorities said. The two unidentified suspects drove a 2004 Dodge Durango into the Detroit-Windsor tunnel Tuesday night and were stopped for an inspection. During the inspection, a "suspicious device" was found, forcing an evacuation of the crossing.

The tunnel was closed in both directions for nearly three hours while authorities deployed a weapons inspections team that used a robot to get a closer look. The team identified the device as an unmarked commercial grade smoke bomb, according to police in Windsor, Ontario. The operation also resulted in the discovery of two butterfly knives and a set of brass knuckles. The two suspects, 29 and 17, were taken into custody and were expected to appear in court Wednesday afternoon, where they were expected to be charged on weapons offenses. Nearly 12,000 vehicles travel the Detroit-Windsor tunnel every day.

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WPS Public News Update: Suspicious package investigated at Windsor-Detroit Tunnel. http://t.co/C0ikyaaQqj ^MD — Windsor Police (@WindsorPolice) January 21, 2015

— Shamar Walters and Jon Schuppe