The attacker used the fire alarm "so the kids would come pouring out of the classrooms into the hall", Sen.
He eventually fled the scene.
At a family reunification center set up at the Fort Lauderdale Marriott Coral Springs Hotel, Golf Club & Convention Center, Rabbi Avraham Friedman of Chabad Coral Springs was with parents who "are in agony".
The motive behind the shootings is still unclear.
"It happened there, how do you know it's not going to happen to you next?"
Marjory Stoneman Douglas High School is a public school with about 3,000 students.
"People were jumping fences".
At least 17 people were killed Wednesday when a lone gunman opened fire in a Florida high school, according to police. Three people remain in critical condition. Potentially there could have been signs out there. Dozens of police and emergency services personnel swarmed the area immediately.
Two students, a boy and a girl, passed away and 17 other students were badly injured.
Police say the gunman was armed with a semiautomatic AR-15 rifle and carried "multiple" magazines with him.
Sheriff Israel said Cruz was arrested without incident after he was located off the school grounds. They did not specify when he was expelled or the specifics of his expulsion.
"Nicolas Cruz was the killer".
Sheriff Israel said of him: "We already began to dissect his websites and the things on social media that he was on and some of the things that came to mind are very, very disturbing". "He died a hero and he will forever be in our hearts and memories".
Contact 5 compared one of the photos on the Instagram pages to a photo of Cruz sent to our newsroom by an arresting law enforcement officer. Specifically, they want legislation on tighter gun control.
Florida Governor Rick Scott said the shooting was "absolutely pure evil".
President Trump addressed the shooting on Twitter on Wednesday afternoon.
Four in Your Corner is looking into what schools in Southwest Florida are doing to keep students safe in the wake of the Parkland school shooting. "In this case, we didn't find a way to connect with this kid", Furr said.