Broward County (FL) Sheriff's deputies and other law enforcement officers are responding to an active shooter at Marjory Stoneman Douglas High School in Parkland. Reports say as many as 20 people have been injured.

The Broward Sheriff’s Office sent out a tweet Wednesday, just before 3 p.m., calling this an “active shooter” situation.

SWAT is on scene with an armored rescue vehicle. Some students are still in the school, some are being evacuated.

Margate Fire Rescue has deemed this a mass causality incident, which means at least 20 people have been injured, WSVN TV reports.

Associated Press is reporting the suspect is still at large.