Bomb threat leads to US-Canada bridge closing

Detroit police say a bomb threat has led authorities to close one of the busiest bridge-crossings between the U.S. and Canada, just four days after a similar threat closed a nearby international commuter tunnel.Police spokeswoman Sgt. Eren Stephens says a call came in to authorities on the U.S. side of the Ambassador Bridge pertaining to a bomb on the bridge around 7:20 p.m. Monday. The bridge connects Detroit to Windsor, Ontario.Stephens says the call prompted authorities in both cities to halt truck and car traffic across the bridge. So far, authorities havent reported finding a bomb.On Thursday, a bomb threat was phoned in to Windsor authorities that lead to a four-hour closing of the Detroit-Windsor Tunnel, the other crossing between the border cities. No bomb was found.