In this photo taken on March 16, 2014, Bill Hefler, of ESG Security, looks up to the stands during a time out in the second half of an NCAA college basketball game between Ohio State and Michigan in

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In this photo taken on March 16, 2014, Bill Hefler, of ESG Security, looks up to the stands during a time out in the second half of an NCAA college basketball game between Ohio State and Michigan in the semifinals of the Big Ten Conference tournament in Indianapolis. Security firms charged with protecting college and professional sports venues are monitoring social media more than ever to prepare for everything from a garden-variety court storming to something much more dangerous. (AP Photo/Kiichiro Sato)

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Associated Press
Thu, Mar 27, 2014 9:56 AM EDT