2014 Peshawar school massacre

On 16 December 2014, six gunmen affiliated with the Tehrik-i-Taliban Pakistan (TTP) conducted a terrorist attack on the Army Public School in the northwestern Pakistani city of Peshawar. The terrorists, all of whom were foreign nationals, comprising one Chechen, three Arabs and two Afghans, entered the school and opened fire on school staff and children, killing 149 people including 132 schoolchildren ranging between eight and eighteen years of age, making it the world's eighth deadliest school massacre.

Source: Wikipedia — 2014 Peshawar school massacre (CC BY-SA 4.0)