The suspected gunman arrested in connection with Wednesday's shooting at a Florida high school, which left at least 17 people dead, was identified by the sheriff as 19-year-old Nikolas Cruz.
Officials said the shooter was equipped with a gas mask and smoke grenades — in addition to an AR-15 semi-automatic rifle and multiple magazines — as he allegedly opened fire at Marjory Stoneman Douglas High School in Parkland, which Broward County Sheriff Scott Israel said Cruz had been expelled from for disciplinary reasons.
A bomb squad from the Palm Beach County Sheriff's Office reportedly plans to serve a search warrant at a mobile home park in Lantana, roughly 30 miles north of Parkland, which WPEC reports is related to the shooting.
According to the Palm Beach Post, the FBI, the Broward County Sheriff's Office and the Bureau of Alcohol, Tobacco, Firearms and Explosives were investigating a possible explosive device at the mobile home related to the school shooting.
Cruz, according to student Daniel Huerfano, "was that weird kid that you see" at school, "like a loner." His adoptive mother, according to the Sun Sentinel, died in November at age 68 from an "unspecific illness."
Another student, Victoria Olvera who's a junior at the school, said Cruz was expelled last year after fighting with his ex-girlfriend's new boyfriend. She said Cruz was abusive to the girl.
"I think everyone had in their minds if anybody was going to do it, it was going to be him," Olvera said.
A former classmate told Fox News Wednesday night she recognized the suspected shooter as an employee at a dollar store.
An Instagram page apparently belonging to Cruz showed pictures of guns and knives. Israel said some of Cruz's social media posts were "very, very disturbing."
One student told WJXT that “everyone predicted” the shooting, which killed multiple people, according to police.
“Honestly, a lot of people were saying it was gonna be him,” the unnamed student told the news station. He said kids joked around that the student would be the one to “shoot up the school.”
“It turns out, everyone predicted it,” the student said, adding the suspect knew the layout of the school.
“Yeah, he was on the third floor. He knows the school layout, he knows where everyone would be at as of right now,” the student said. “He’s been with us in fire drills, he’s prepared for this stuff.”
Another student told WSVN that the suspect is a "troubled kid" who has "always had a certain amount of issues going on."
"He shot guns because he felt it gave him, I guess, an exhilarating feeling," the unnamed student added.
While some teachers said he demonstrated warning signs, Superintendent Robert Runcie said he was not aware of any specific warnings the school district had received regarding the shooter.
Jim Gard, who said he was Cruz's teacher around August to September 2016, told Fox News he wasn't shocked to hear his former student's name circling around.
"It hit me like wow. ... Am I shocked? No, I hate to say it," Gard said. "Nothing's shocking anymore. And that's horrible."
Gard told the Miami Herald that Cruz was seen as a potential threat in the past, as he allegedly threatened students last year.
“We were told last year that he wasn’t allowed on campus with a backpack on him,” the teacher said. “There were problems with him last year threatening students, and I guess he was asked to leave campus.”
Another student told WSVN he “stayed clear of [the suspect] most of the time."
“My time in alternate school, I did not want to be with him at all because I didn’t want to cause any conflict with him, because of the impression he gave off,” the student said of the shooter.
Mike Watford, who graduated from the high school in 2016, told BuzzFeed News that "something definitely pushed [the suspect]" before he allegedly opened fire at the school on Wednesday.
Cruz, according to Watford, often said "how tired he was of everyone picking on him and the staff doing nothing about it."
Watford's brother, Giovanni, described Cruz to the news outlet as "a sketchy kid," who was "off" and "super stressed-out all the time and talked about guns a lot and tried to hide his face."
Another junior at Marjory High, Dakota Mentcher, said Cruz "started progressively getting a little more weird," and recalled how the suspect published Instagram posts about killing animals. She also said Cruz had talked about doing target practice in his backyard with a pellet gun.
Wednesday's shooting at Marjory Stoneman Douglas High School was the 25th deadly shooting at a U.S. elementary, middle or high school since — and including — Columbine in 1999. There have been a combined 98 deaths as a result.