Students released from a lockdown are overcome with emotion following following the shooting at Marjory Stoneman Douglas High School in Florida. Photograph: AP

At 2.40pm on Wednesday a 19-year-old man wearing a gas mask walked into his former high school armed with smoke grenades and an AR-15 style rifle. Af(...)

Authorities investigate the scene of fatal school shooting Tuesday,  in Benton, Kentucky. Kentucky State Police said the suspect was apprehended by a Marshall County deputy. Photograph: Stephen Lance Dennee/AP Photo

A 15-year-old student opened fire with a handgun inside a rural Kentucky high school on Tuesday, killing two of his classmates, injuring 17 and sendi(...)