BLOOMINGTON, MN - FEBRUARY 23: Mall of America Director of Security Major Doug Reynolds explains the social media monitoring team during a tour of Mall of America security systems on February 23, 2015 in Bloomington, Minnesota. In a newly released video, Somali militant group al-Shabaab called for terror attacks at a number of sites, including Mall of America, the largest shopping mall in the United States. (Photo by Adam Bettcher/Getty Images)
