3 children, 3 adults shot dead by ex-student at US school
The motive was not immediately known but the suspect had drawn detailed maps of the school, including entry points for the building, and left behind a 'manifesto'.
Investigators question delayed police response in US school shooting
The official accounts of how police responded to the shooting have flip-flopped wildly.
6 killed in Russian university shooting, gunman in hospital
Video shown on news websites showed panicked students leaping from first-floor windows to escape Perm State University, landing heavily on the ground before running to safety.
At least 8 children, one teacher killed in mass shooting at Russia school
A teenager was detained after the attack at the school, located 820km east of Moscow in the mainly Muslim republic of Tatarstan.