Shocking and heartbreaking pictures show students running for their lives from the school with their hands on their heads, as SWAT police carrying guns escort them away from the premises.
A 19-year-old gunman returning to a Florida high school where he had once been expelled opened fire with an assault rifle, killing at least 17 people and wounding more than a dozen others before he was arrested and taken into custody.
The shooting at Marjory Stoneman Douglas High School in Parkland, a placid, middle-class community about 45 miles north of Miami, ranked as the second-deadliest act of gun violence ever on a US public school campus.
Photos also show families and friends reuniting with loved ones, and others desperately trying to locate theirs.