From News.Yahoo.com:
By Corey Williams
Detroit, MI (AP) — Officials shut down the international commuter tunnel that connects Detroit with Windsor, Ontario, Canada, on Thursday as authorities investigated a bomb threat.
The Detroit Windsor Tunnel was closed to traffic after the threat was called in on the Canadian side at 12:30 p.m. to the duty free shop on a plaza on the tunnel’s Windsor side, said tunnel executive vice president Carolyn Brown.
The underwater tunnel stretches about one mile beneath the Detroit River, which is one of North America’s busiest trade crossings.
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