( CNN ) -- The major tunnel between Windsor , Ontario , and Detroit was scheduled to reopen at 5 p.m . ET Thursday following a shutdown because of a bomb threat , Windsor police said . Police `` fully inspected '' the tunnel before reopening it , Windsor authorities said . The bomb threat led to traffic backups as drivers on both sides of the border were rerouted . Employees at the Detroit-Windsor Tunnel received an anonymous phone call around 12:30 p.m. from someone saying there was a bomb in the tunnel , Sgt . Matthew D'Asti with Windsor police told HLN . Authorities were working together on both sides of the border to investigate and search the tunnel for any possible device , D'Asti said . Neal Belitsky , president and CEO of Detroit-Windsor Tunnel , said the threat was called in to the Canadian side . Authorities treated the matter `` as a nonspecific , anonymous bomb threat , '' said D'Asti . The tunnel was evacuated . The tunnel is one of two international crossings between the cities of Windsor and Detroit . Traffic was being routed to the other , a bridge about two miles away . Approximately 27,000 to 29,000 vehicles pass daily through the tunnel , which opened in 1930 . The Coast Guard said it set up a safety zone in the Detroit River in order to keep vessels away from the tunnel . CNN 's Chandler Friedman , Devon Sayers and Michael Martinez contributed to this report .
NEW : Windsor police reopening `` fully inspected '' tunnel . The call came from the Canadian side , officials say . A man who was shot in a parking lot at an apartment complex on Friday morning is expected to survive. The tunnel was evacuated ; no bomb has been found , an official tells HLN .