FREDERIC J. BROWN/Getty Images
Christina Coleman
Feb, 14, 2018

UPDATE: Feb. 14, 2018 - 4:30 PM

According to MSNBC, the shooter has been taken into custody, although police say the scene is still "active"

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A shooting at Marjory Stoneman Douglas High School in Parkland, Florida has left multiple people injured and possible fatalities, according to the Broward County Sheriff's Office.

Authorities responded to reports of an active shooter around 4 p.m. Wednesday afternoon. It is unclear if the shooter is in custody.

From NBC News:

Sen. Bill Nelson, D-Fla., told MSNBC just before 4 p.m. that "there were a number of fatalities," citing Broward County officials, and that the shooter was not in custody, although authorities believed they knew who he was. "This is a really bad day," Nelson said.

Multiple livestreams show students running in lines away from the school building. Other aerial footage showed people lying on the ground.

President Donald Trump has been briefed on the situation, sending a tweet to offer his "thoughts and prayers" to those experiencing what many have reported to be one of more than six dozen mass shootings since he took office last year.

The school remains on lockdown, and many parents have told local outlets that their children are still in the building.

According to CNN:

Nicole Baltzer, 18, said she was in trigonometry class about 10 minutes before the end of the school day when the fire alarm went off. As students evacuated, she heard six gunshots and everyone started running back inside the school, Baltzer told CNN's Sara Ganim. "I heard so many gunshots, at least like six. They were very close," Baltzer said. Baltzer said she is still on lockdown in a classroom on the second floor. Her stepsister is also on lockdown in a different classroom, she said.

This is a developing story.