At least 17 people, including students, were killed after a former student opened fire at a Florida high school, law enforcement officials said on Wednesday.
The shooting suspect, identified as Nicolas Cruz, has been taken into custody. The FBI is assisting local officials in the investigation.
"Nicolas Cruz was the killer. He is in custody. We already began to dissect his websites and social media that he was on ... some of the things that come to mind are very, very disturbing," Broward County Sheriff Scott Israel told reporters at a news conference in Florida.
Cruz, 19, was a former student of Marjory Stoneman Douglas High School in Parkland, Florida, where the shooting took place.
Israel said Cruz got expelled from the school for disciplinary reasons.
The suspect had countless magazines, he added.
"At this point, we believe he had one AR-15 rifle. I don't know if he had a second one," the sheriff said answering a question. The suspect was treated and released to the police.
Of the 17 dead, 12 were inside the building, two were shot dead just outside the building, one was on a street outside the school, and two people lost their lives at a hospital. Israel, however, could not confirm the number of victim students.
The school has a large number of Indian-American students and at least one student from the community has been injured in the incident.
The student, a ninth grader, sustained minor injures as he was hit by splinters. He is being treated at a hospital.