Bomb threat at Detroit's Comerica Park An American Flag on the field during the singing of the 'Star Spangled Banner' at a Detroit Tigers game at Comerica Park in 2011. DETROIT, July 18 (UPI) -- Detroit police and U.S. Homeland Security personnel responded to a bomb threat at Comerica Park Tuesday night and said no suspicious device was found. The bomb threat -- the second in the Detroit area this week -- was phoned in to 9-1-1 at about 8 p.m. during the game between the Detroit Tigers and the Los Angeles Angels, Sgt. Eren Stephens told The Detroit News. No one was evacuated from the park, and the all-clear was given by 11 p.m., the newspaper said. A bomb threat shut down the Ambassador Bridge, which spans the border with Canada, from about 7 p.m. Monday to 1 a.m. Tuesday, and a similar threat was received for the Detroit-Windsor Tunnel last week. "We're following leads, and relative to the most recent incident; I think they're promising leads," Police Chief Ralph Godbee said. But we're far from saying we're close to closing anything. Michigan Gov. Rick Snyder and Canadian leaders last month announced an agreement to build a new border crossing. A spokeswoman for Snyder Tuesday cited "homeland security and economic security issues" as factors that show the need for an additional border crossing.