RAWALPINDI, PAKISTAN FEBRUARY 01: Pakistani security guards stand alert as students arrive at their schools, which were reopened after being closed for one week due to security threats by Taliban militants following their assault at a university in the town of Charsadda in northwest Khyber Pakhtunkhawa killing 21people, in Rawalpindi, Pakistan, on February 1, 2016. (Photo by Muhammed Reza /Anadolu Agency/Getty Images)
