Breaking: At least 16 fatalities in the Florida school shooting, law enforcement sources tell @evanperez

— Jim Sciutto (@jimsciutto) February 14, 2018

More: weapon was an AR-15, a semi-automatic rifle frequently used in mass shootings including Newtown, Aurora and San Bernardino. https://t.co/2C0cZqeQhC

— Jim Sciutto (@jimsciutto) February 14, 2018