The 19-year-old accused of shooting and killing 17 people at his former high school told police he carried out the rampage, according to a probable cause report.
In an interview with police, Nikolas Cruz said "he was the gunman who entered the school campus armed with an AR-15 and began shooting students that he saw in the hallway and on the school grounds," the document states.
"Cruz stated that he brought additional loaded magazines to the school campus and kept them hidden in a backpack until he got on campus to begin his assault."
Cruz has been charged with 17 counts of premeditated murder in the deaths of students and staff at Marjory Stoneman Douglas High School in Parkland on Wednesday afternoon, reports CNN.
A judge ordered that Cruz be held without bond at a hearing Thursday afternoon, reports KNSD.
The FBI said they investigated a 2017 comment made on a YouTube channel possibly connected to the suspect that said "I'm going to be a professional school shooter." Officials said they were unable to identify the person who made the comment.