The girl, whose profile says she is 16, tweeted on Wednesday: "THERE'S A SCHOOL SHOOTING RN [right now] AT MY SCHOOL" as news broke of a gunman entering Marjory Stoneman Douglas High School in Parkland, Florida.
The 19-year-old suspect, Nikolas Cruz, is a troubled teenager who posted disturbing material on social media.
Broward Sheriff Scott Israel told reporters that Cruz used a Colt AR-15 semiautomatic assault rifle as he confirmed the number of fatalities.
An unnamed student told the local WJXT news channel that students "joked" that Cruz would one day shoot up the school.
"Seventeen people were taken to the Broward Health hospitals", said Dr. Evan Boyar, Chair and Medical Director of Broward Health North.
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Local officials said at least 17 people have been killed.
"It is a horrific situation", he said.
Television footage showed police putting a person in the back of a police vehicle outside the high school. And, according to law enforcement, a thorough search of his background and social media accounts has begun since the tragic shooting.
It is said that Cruz threw around smoke grenades into a hallway to set off fire alarms, so the pupils would rush out of their classrooms.
My prayers and condolences to the families of the victims of the bad Florida shooting.
"Just pray for this city; pray for this school, the parents, the folks that lost their lives". "You feel for everyone that was wounded, all those injured, their families, thoughts and prayers go out to them", Hilbrecht said.
In the late press conference, Florida Governor Rick Scott, a Republican, said it was an act of "pure evil" but refused to discuss gun controls.