PARKLAND, Fla. — A shooting at a Florida high school caused "numerous" fatalities Wednesday, Broward County Public Schools Superintendent Robert Runcie said.
Local officials said at least 17 people have been killed.
"It is a horrific situation," he said. "...It is a horrible day for us."
Gunfire broke out about 3 p.m., just before dismissal time, at at Marjory Stoneman Douglas High School in Parkland, about 30 miles north of Fort Lauderdale.
The alleged gunman has been identified by a U.S. Official as Nikolas Cruz, 19.
At least 14 people were injured, local officials said.
The Broward County Sheriff's Office gave no details in briefly tweeting that development shortly after 4 p.m. It did not identify the suspected shooter nor say how the person was taken into custody, but did say the scene was still active.
Television footage showed police putting a person in the back of a police car outside the high school.
The school enrolls more than 3,150 students in grades 9 through 12, according to data from the 2015-16 school year.
Coral Springs Police are advising students and teachers to remain inside. People are being advised to avoid the area.
TV footage showed students rushing into the streets as SWAT team members swarmed in and locked down the building. For at least an hour, police were warning that the shooter was still at large even as ambulances converged on the scene and emergency workers appeared to be treating those possibly wounded.
A nearby middle school was put on lockdown as a precaution, and a parent staging area has been set up at the Marriott Hotel at 11775 Heron Bay Blvd. in Coral Springs.
Florida Gov. Rick Scott has spoken with local officials about the shooting.
"Just spoke with @POTUS about shooting at Marjory Stoneman Douglas High School," he tweeted. "My thoughts and prayers are with the students, their families and the entire community. We will continue to receive briefings from law enforcement and issue updates."
President Donald Trump expressed his condolences to the victims.
"My prayers and condolences to the families of the victims of the terrible Florida shooting," he tweeted. "No child, teacher or anyone else should ever feel unsafe in an American school."