( CNN ) -- Bomb threat closes the Ambassador Bridge between Detroit and Windsor , Ontario . A Coast Guard spokesman said it is ` ` too soon '' to say who initiated the threat . A similar threat last week closes the Detroit - Windsor Bridge .
Bomb threat closes the Ambassador Bridge between Detroit and Windsor , Ontario . A Coast Guard spokesman said it is ` ` too soon '' to say who initiated the threat . A similar threat last week closes the Detroit - Windsor Bridge .