A 19-year-old gunman returning to a Florida high school where he had once been expelled opened fire with an assault rifle on Wednesday, killing 17 people and wounding more than a dozen others before he was arrested, authorities said.
The shooting at Marjory Stoneman Douglas High School in Parkland, a placid, middle-class community about 45 miles (72 km) north of Miami, ranked as the second-deadliest act of gun violence ever on a U.S. public school campus.