The discovery of two inactive grenades inside a vehicle led to a seven-hour closure of Canada-bound traffic at the busiest border closing with the US.
The inert grenades were found submerged in an unidentified white powdery substance, police said, leading to the closure of the Ambassador Bridge from about 9am to about 4pm on Monday local time.
“We would like to thank the public for your patience in this matter,” Windsor police said.
“All necessary precautions were taken for the safety of the community and everyone involved during this incident.
"We understand that any incident which causes a closure of an international border can have far-reaching impacts, however, it was imperative during this incident to take all necessary precautions under the circumstances presented.”
No criminal charges will be brought against the U.S. man driving the vehicle, police said.
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