Florida Shooter Nikolas Cruz Threatened a Mass Shooting Nine Months Ago

This video screen grab image shows shooting suspect Nikolas Cruz at Broward County Jail in Ft. Lauderdale, Florida on Feb. 15, 2018. The heavily armed teenager who gunned down students and adults at a Florida high school was charged Thursday with 17 counts of premeditated murder, court documents showed. Miguel Guttierez/AFP/Getty Images

Nikolas Cruz, who allegedly shot 17 students and teachers at a Florida high school on Feb. 14, apparently threatened a mass shooting almost a year ago.

Cruz was charged with 17 counts of premeditated murder on Thursday, Feb. 15 after the massacre at Marjory Stoneman High School in Parkland, north of Miami.