Fans go though newly enhanced NFL security before entering the Metrodome for the Minnesota Vikings and Houston Texans preseason football game, Friday, Aug. 9, 2013 in Minneapolis. (AP Photo/Andy King)
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Fans go though newly enhanced NFL security before entering the Metrodome for the Minnesota Vikings and Houston Texans preseason football game, Friday, Aug. 9, 2013 in Minneapolis. (AP Photo/Andy King)
