(ORLANDO, Fla.) -- A shooting at an Orlando nightclub early Sunday morning has been described as a "mass casualty situation," police announced Sunday morning.
"The shooter inside the nightclub is dead," tweeted Orlando Police shortly before 6 a.m.
Shortly before announcing the shooter's death, Orlando Police tweeted, "We can confirm this is a mass casualty situation. Support from local/state/federal agencies." The FBI were also at the crime scene.
Orlando Regional Medical Center, located near the nightclub, said it received "several gunshot victims," in a statement released at 5 a.m.
The statement read, "Orlando Regional Medical Center was placed on lockdown around 2:00 a.m. after receiving several gunshot victims. Only essential workers are being allowed access into the building. Out of an abundance of caution, Arnold Palmer Hospital and Winnie Palmer Hospital have also been placed on lockdown."
After 2 a.m., Pulse Nightclub posted on its Facebook page, "Everyone get out of pulse and keep running."
Orlando Police tweeted around 4:30 a.m., "This is a fluid scene and we are working on getting you an update."
This is a developing story. Check back for more updates.
Copyright © 2016, ABC Radio. All rights reserved.