FILE - This April 5, 2012 file photo shows fans outside Comerica 

FILE - This April 5, 2012 file photo shows fans outside Comerica Park before a baseball game between the Detroit Tigers and Boston Red Sox,  in Detroit. Comerica Park is the latest Detroit landmark to be the subject of a bomb threat. Police say an anonymous caller issued the threat in a 911 call around 8 p.m. Tuesday, July 17, 2012,  as the Tigers were hosting the Los Angeles Angels in front of 34,000 fans. (AP Photo/Carlos Osorio, File)
Associated Press
FILE - This April 5, 2012 file photo shows fans outside Comerica Park before a baseball game between the Detroit Tigers and Boston Red Sox, in Detroit. Comerica Park is the latest Detroit landmark to be the subject of a bomb threat. Police say an anonymous caller issued the threat in a 911 call around 8 p.m. Tuesday, July 17, 2012, as the Tigers were hosting the Los Angeles Angels in front of 34,000 fans. (AP Photo/Carlos Osorio, File)
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