At least 17 people have been killed in a mass shooting at a high school in Parkland, Florida, police say.
The suspect has been named as Nikolaus Cruz, 19, and is a former student at the school who had been expelled.
Cruz, who was armed with “multiple magazines”, began the shooting spree outside the school before opening fire inside, according to officials.
Students were forced to hide in classrooms as police scoured the building.
Broward County Sheriff Scott Israel told reporters that Cruz had used a rifle and opened fire outside the school where three people were killed. He then entered the building and killed 12 people.
Two people later died after being taken to hospital.