Nation Mackinac Bridge north of Detroit closes after report of bomb threat, officials say; reopens after 3 hours July 18, 2021Sam Fogel, Detroit Free PressComments Off on Mackinac Bridge north of Detroit closes after report of bomb threat, officials say; reopens after 3 hours The Mackinac Bridge, located north of Detroit, was closed for several hours on Sunday after Michigan police received a bomb threat.
