At least 17 people are dead after a 19-year-old man opened fire at a high school campus in Parkland, Florida, police have said.
The suspect has been named as Nikolas Cruz, 19, a troubled former student who loved guns and was expelled for unspecified disciplinary reasons.
Cruz was arrested abut an hour after a shooting rampage. He was found with multiple ammunition magazines and one AR-15-style rifle, Reuters reports.
As the attack unfolded students were forced to hide as police swooped in on the building.
Broward County Sheriff Scott Israel told reporters Mr Cruz killed three people outside the school, before entering the building and killing another 12.
Two people later died after being taken to hospital.
“It’s catastrophic. There really are no words,” Sheriff Israel tweeted later.
It is one of the deadliest school shootings since 26 people were killed at a Connecticut school in 2012.