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Two Michigan men were being held Wednesday after customs officers found a suspicious package in their vehicle Tuesday that appeared to contain a smoke bomb or grenade as they tried to enter Canada, Windsor police said.

The discovery resulted in the Detroit Windsor Tunnel closing in both directions shortly after 5 p.m. Tuesday as police investigated the package.

The tunnel reopened by 9 p.m., Windsor police said.

The two Michigan men entered Canada about 5 p.m. Tuesday and were flagged for a secondary inspection, during which "a bag was discovered to contain a suspicious device," according to the Windsor authorities.

Canadian Border Services Agency officials closed the tunnel, notified police and evacuated staff.

The Windsor Police Explosives Disposal Unit was called to investigate; members deployed a robot with an on board camera.

"Investigation has revealed that the bag contained an unmarked cardboard cylinder with a fuse attached," police said in a statement. "EDU members are satisfied that the device is consistent in structure as being a commercial grade smoke bomb or smoke grenade. These types of devices emit a thick cloud of smoke when ignited."

Elsewhere in the vehicle, officers also found a pair of brass knuckles,a switchblade knife and a butterfly knife.

"The men could be facing charges in relation to the brass knuckles and depending on the nature of the package," Windsor police Sgt. Matthew D'Asti said.

The Windsor police's major crimes branch is continuing to investigate.

Anyone with information is asked to call Windsor Police at (519) 255-6700 ext. 4830 or Crime Stoppers at (519) 258-8477 (TIPS), go to www.catchcrooks.com or submit a tip at https://www.facebook.com/Windsor.Police.Service.

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