FOX News reports that a man has been arrested and confessed to shooting 17 victims in a mass school shooting in Florida this week. Nikolas Cruz, 19, was arrested after killing three adult staffers and 14 students at Marjory Stoneman Douglas High School on Wednesday. He has appeared in court and is facing 17 counts of premeditated murder.

Noted as the deadliest school shooting since 2012, BBC reports that he entered the campus armed with an AR-15 and began shooting students, then got rid of the weapon and blended in with fleeing students to escape. He also had extra ammunition in a backpack and bag.

After fleeing the scene, Cruz visited a Walmart and McDonalds before being spotted by police and apprehended, says BBC.

Cruz had been expelled from the school for undisclosed reasons, and other students stated he was crazy about guns and an outcast.

After posting a YouTube comment about becoming a professional school shooter last year, Cruz was reported to the FBI. Attorney Jeff Sessions has since called for a review after being notified that the FBI did not act on the tip. The FBI has said that the caller’s information was not forwarded to the Miami office, because protocols were not followed for something that should have been considered a potential threat to life.

Cruz has had several run-ins with authorities over the years, and police responded to twenty 911 calls from where he lived with his brother and adoptive mother, says BuzzFeed.

Dating from 2010 to 2016, the calls were typically a result of the boys fighting and throwing things. Cruz was never arrested and was determined not to be a threat by a therapist quoted in a police report in September 2016.

In the police report for that call, it was stated that Nikolas had been talking about getting a gun and had been harming himself. However, the therapist called to the scene determined there were no signs of mental illness from Cruz.

Although Cruz took medication for ADHD and OCD, he purchased the AR-15 legally prior to moving in with his friend after his mother’s death in November.

Cruz is currently being held without bail.

*Photo credit FOX News