Parkland, Fla., School Locked Down Due to Active Shooter
Authorities are responding to a reported active shooter situation at Marjory Stoneman Douglas High School in Parkland, Florida.
The Broward County Sheriff's Office said deputies were responding to reports of a shooting shortly before 3 p.m.
Half an hour later, the shooter was believed to still be in the building. Local media report Broward County has designated the situation a "Level 3 casualty incident," meaning at least 20 people have been injured.