GUNFIRE rings out as screaming pupils crouch under their desks in horrifying footage from the Florida school shooting yesterday.
Videos posted on social media from inside Marjory Stoneman Douglas High School in Parkland near Miami, Florida, show the full scale of the terrifying rampage.
Nikolas Cruz, 19, massacred 17 people and wounded dozens more at the school where he was once a student.
Broward Country Schools Superintendent Robert Runcie said: "There are numerous fatalities. It's a horrific situation".
Students hid in classrooms until they were rescued by police in tactical gear.
Chilling mobile phone footage captures pupils huddled under their desks as piercing gunshots ring out just feet away.
It is captioned: "Our f***ing school is getting shot up", while another shows a damaged computer with the words: "There's bullet holes in the f***ing computer".
McKenzie Hartley, 19, the sister of a student at the school, said: "She heard him shooting through the windows of classrooms and two students were shot."
Dozens of students were seen after the attack weaving their way between law enforcement officers armed with heavy weapons and helmets.
Student Jeiella Dodoo told CBS News that she and her schoolmates had evacuated their classroom calmly after hearing what they thought had been a routine fire alarm.
She said: "The alarm went off so we had to evacuate from our classes.
"Then we heard gunshots.
"I heard about six gunshots and then some people started running and then everyone started running because we were like, 'If it's real, then just run.'"
Large numbers of emergency vehicles including police cars, ambulances and fire trucks surrounded the area.
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Parkland Mayor Christine Hunschofsky told CNN: "This is a very tragic situation for everybody involved.
"They were very scared and almost in shock when they came out."
Florida Governor Rick Scott said on Twitter that had he had been in touch with local officials about the incident.
The shooting was the latest in a deadly series of attacks at US schools.
A 15-year-old gunman in January killed two students at a Benton, Kentucky, high school.
The school had recently held a meeting to discuss what to do in such an attack, Ryan Gott, a 15-year-old freshman told CNN.
President Donald Trump has said: "My prayers and condolences to the families of the victims of the terrible Florida shooting.
"No child, teacher or anyone else should ever feel unsafe in an American school."
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