Students evacuate  Marteena Hall as North Carolina A&T State University canceled classes Monday, April 28, 2014 and locked down some buildings while police searched for a man who was reported to be carrying a rifle on campus, in Greensboro, N.C. The lockdown was lifted after a search failed to find any sign of the reported gunman. (AP Photo/News & Record, at North Carolina A&T State University)
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