From Miami Herald:
An American nightmare unfolded Wednesday afternoon at a South Florida high school after police say an expelled teenager returned to campus and opened fire with an assault rifle, killing 17 and wounding 15 more in the worst school shooting in Florida history.
Just before dismissal at Marjory Stoneman Douglas High School in Parkland, thousands of students puzzled at the sound of a fire alarm were launched into a panic when gunfire punctuated the din. As teachers and students fled through hallways and hid under desks, a gunman opened fire, leaving a trail of bodies and stunned confusion in his wake.
The Broward Sheriff’s Office says Nikolas Cruz, 19, walked the halls of the high school wielding an AR-15 and equipped with multiple magazines. U.S. Sen. Bill Nelson told reporters that Cruz pulled a fire alarm and then, wearing a gas mask, began tossing smoke bombs and shooting people as they ran through the haze.