The Detroit Windsor Tunnel was closed to traffic after the threat was called in on the Canadian side, tunnel chief executive Neal Belitsky told The Associated Press. The call was made some time after 12:30 p.m. to the duty free shop on a plaza on the tunnel’s Windsor side, tunnel executive vice president Carolyn Brown said.
Initially, traffic going onto plazas on both sides of the tunnel was halted and diverted away from the tunnel. Offi-cials then decided to clear the tunnel and block off entrances and exits on both sides, Brown said.
Bomb squads from the Detroit and Windsor police departments were called in to help with the investigation, and traffic in both cities was redirected to the Ambassador Bridge, located just west of downtown.
About 4.5 million cars used the 82-year-old underwater tunnel in 2011. It stretches about a mile beneath the De-troit River, between downtown Detroit and downtown Windsor.
Traffic on the Ambassador Bridge was flowing smoothly into the United States after the threat was called in to the tunnel, but it was delayed by customs heading into Canada, said Mickey Blashfield, a spokesman for the company that operates the bridge.