Police in Canada say they're looking at video from a coffee shop for any clues to the man who called in a bomb threat at the international tunnel connecting Detroit and Windsor, Ontario.

The threat on Thursday turned out to be false, but the Detroit River tunnel was shut down for nearly four hours while authorities responded. Windsor police Sgt. Matthew D'Asti says a man calling from a pay phone warned that a bomb was in the tunnel on the Canadian side.

D'Asti said Friday that police are examining video from a nearby Tim Hortons coffee shop, but it's not known if the camera recorded footage of the public phone. D'Asti says police also are inspecting the phone for any evidence such as fingerprints.

SLIDESHOW: Detroit-Windsor Tunnel closed due to bomb threat

Published On: Jul 12 2012 02:12:36 PM EDT   Updated On: Jul 12 2012 02:36:41 PM EDT

The Detroit-Windsor Tunnel was shut down Thursday afternoon on the report of a bomb threat.

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