'This is unbelievably catastrophic' – Shooter thought to be 18-year-old former student

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"This is unbelievably catastrophic," is how Broward County Florida Sheriff Scott Israel described the shooting scene at a Florida high school. 

There are multiple dead and injured after the violent incident today at Marjory Stoneman Douglas High School in Parkland, US. 

"I'm sick to my stomach," Mr Israel said to US ABC today. 

"There are folks who have lost their lives."

He could not confirm how many are dead, but could say it was more than one. 

The suspected shooter was found off campus, with reports he blended into fleeing students to escape to a nearby suburb where he was captured by police. 

Mr Israel said the was thought to be 18-year-old and attended the high school but was not a current student. 



Video: Suspected Florida school shooter led away in handcuffs after dozens injured, possible deaths

The moment the suspected shooter was taken out of a police car and put onto a stretcher shows the man in handcuffs. 

The Boward County Sheriffs tweeted there are 14 victims who have been taken to hospital. Fatalities have not yet been confirmed but Broward County Public Schools superintendent Robert Runcide said there were "numerous fatalities".

Multiple sources reporting gunman is now in custody. 

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Children hiding in closets after gunman injured multiple victims in Florida shooting

Watch the live view of the outisde the scene on 1 NEWS' Facebook page. 

Children are currently in lockdown at a Florida school after a gunman has reportedly injured multiple people.

"All of a sudden there was a really loud noise…..people are crying in the closet," a student texted newsite CBS4's Rick Folbaum.

CBS4 reported the school was in lockdown from 3pm (local time), but some students were walking out of the school with their hands in the air.
The Margate Fire Department estimate 20 to 50 people may be injured.

White House Deputy Press Secretary Lindsay Walters said: "We are moitoring the situation. Our thoughts and prayers are with those affected."

Another student has told news site WSVN they thought there was a fire drill: "But then word started going around that it was shots and not just like something else, everyone just started running towards the canal."

It is estimated between 20-50 people are injured. There are no confirmed casualties currently. 

There are reports the gunman has been caught.