Detroit police say they received another bomb threat on the Ambassador Bridge on Wednesday evening. This time, authorities kept the busy international crossing open while they investigated the call.
Police said the call came about 5:15 p.m, and the site was "officially cleared" for safety at 7 p.m.
This latest bomb threat is the second called on the bridge this week, and it marks the third recent bomb threat on transportation links between the United States and Canada.
On July 12, someone called in a similar threat on the Detroit-Windsor tunnel.
The previous two calls resulted in several-hour shutdowns of the Ambassador Bridge and Detroit-Windsor tunnel, which allowed police to search the area. No bombs were found during either search.
After receiving the latest threat to the Ambassador Bridge on Wednesday, Sgt. Eren Stephens says, police let traffic continue, reports the AP.
A statement from police says "preliminary Intelligence" indicates that Wednesday's caller "may have made hoax bomb threats in the past."
Authorities let Comerica Park remain open Tuesday despite another bomb threat during a Detroit Tigers game.
The Detroit News also reported that a bomb squad responded to a report of a suspicious package found at Cobo Center last Monday.
Although the bomb-related threats occurred over a short time period, it remains unclear if the calls are made by the same people or person, reported the Wall Street Journal:
Andrew Arena, the former head of the Detroit FBI office who now is executive director of the Detroit Crime Commission, said bomb-threat hoaxes often come in bunches. "Is it one person or a copycat? A lot of times somebody does this and then copycat people jump on board," he said. "It's certainly a stress on law enforcement and everybody who has to respond to this stuff."
-Elaine Ezekiel, Michigan Radio Newsroom