Updated at 5:15 p.m. ET
The Broward County, Fla., sheriff said there are "multiple" people dead in the Wednesday shooting at Marjory Stoneman Douglas High School in the city of Parkland, northwest of Fort Lauderdale. He said a suspect is in custody.
Earlier in a tweet, Scott Israel said there are "at least 14 victims." He did not specify whether they were injured or dead.
In a news conference, Israel said the suspect is about 18 years old, was found off campus and was taken into custody without incident. Israel said the suspect is not a current student.
The school was locked down as some students were escorted outside while others were being advised to remain barricaded inside.
Authorities have not determined a motive for the shooting.
Florida Gov. Rick Scott as well as President Trump have been told about the shooting.
This is a developing story. Some things that get reported by the media will later turn out to be wrong. We will focus on reports from police officials and other authorities, credible news outlets and reporters who are at the scene. We will update as the situation develops.