UPDATE: 2 Grenades In Vehicle Caused Ambassador Bridge Closure

DETROIT, MI — New details have come to light surrounding an explosives threat that closed the Ambassador Bridge to traffic for several hours Monday. The international bridge connects Detroit with Windsor, Ontario, Canada.

According to the Windsor Police Department, around 9 a.m. patrol officers, along with the Explosive Disposal Unit (EDU) were dispatched to the 2600 block of Wyandotte Street West for a report that two grenades were located inside a vehicle.

It was reported the grenades were located during a vehicle inspection conducted by the Canada Boarder Services Agency at the Ambassador Bridge International Border Crossing. It was also reported that the grenades were submerged in an unknown white powdery substance, the department said in a news release.

The immediate area of concern was evacuated prior to police arrival and the driver of the vehicle placed into CBSA's custody.

After officers arrived on scene, they closed off several roads in the area to vehicle and pedestrian traffic. The Explosive Disposal Unit (EDU) also attended due to the nature of the call.

Through an investigation, police said no other people were believed to be involved in the incident, and it was determined no direct threats were made specific to other people or places in connection with the grenades.

EDU used a robot for the initial stage of their investigation. A member of EDU obtained samples of the powder for testing. Police said it was determined the powder did not contain energetic properties and was also not hazardous.

Police said another member of EDU attended the vehicle and was able to safely secure the grenades, which were inspected and found to be inert. EDU continued with a thorough search of the vehicle until officers were completely satisfied that no other threats were present.

The scene was condensed at approximately 4 p.m., allowing for traffic flow to resume completely in the area. The scene was cleared by officers at approximately 6:30 p.m.

Following the investigation, no criminal charges were filed. Police said their investigation revealed that there was no intent to cause harm or use the grenades for any nefarious purpose.

"The grenades were inert, as such, not subject to any criminal charges being laid," the department said.

The driver of the vehicle was identified as a man from the United States. Because there are no criminal charges, police are not naming him. After examination by the CBSA, they returned the driver to the United States and turned him over to the custody of U.S Customs and Border Protection.

"We would like to thank the public for your patience in this matter. All necessary precautions were taken for the safety of the community and everyone involved during this incident. We would like to thank the CBSA for their collaborative efforts in this matter and commend them for their actions during the incident which ensured the safety of community members, travelers, employees and the single busiest international border crossing in North America," the police department said in the news release.

"We would also like to thank Windsor Fire and Rescue and EMS for their assistance in this matter. 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," the police department continued.

Anyone with information is asked to contact Windsor Police Service at 519-255-6700 ext. 4000, Crime Stoppers anonymously at 519-258-8477 (TIPS) or online at www.catchcrooks.com.