Security guards stand alert around schools and colleges following an attack on Bacha Khan University, in Peshawar, Pakistan, Thursday, January 21, 2016. Pakistanis buried their dead and observed a day of nationwide mourning Thursday following the brazen attack by Islamic militants who stormed a northwestern university the previous day, gunning down students and teachers and spreading terror before the four gunmen were slain by the military. (Photo by Mohammad Sajjad/AP Photo)
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