Bomb threat closes the Ambassador Bridge between Detroit and Windsor , Ontario . The Ambassador Bridge is the busiest commercial international crossing in North America with more than 10,000 commercial vehicles crossing the bridge on a typical weekday , according to the bridge 's official website . A Coast Guard spokesman says it is `` too soon '' to determine who sent the threat . " The Canadian government has issued a travel warning for U.S. citizens in Canada due to an unspecified threat.
Bomb threat closes the Ambassador Bridge between Detroit and Windsor , Ontario . A Coast Guard spokesman says it is `` too soon '' to determine who sent the threat . " The Canadian government has issued a travel warning for U.S. citizens in Canada due to an unspecified threat.