Chaos ensured in downtown Orlando when a 17-year-old gunman allegedly opened fire during a Halloween celebration early Friday — and many partygoers were terrified that they were going to be killed in the attack.

“It was the most scared I’ve ever been,” Joey Herrera, 22, who was at the celebration with his girlfriend and some other pals, told The Post.

“I was afraid that I was going to be killed, and I didn’t want to die in that way.”

As the sounds of the gunshots echoed through the streets, people scrambled to safety, hiding in nearby businesses or running onto side streets.

At the Mondrian apartments, an upscale high-rise building a block from the revelry, terrified partygoers huddled in the lobby as police cars whizzed by. The complex, usually locked to non-residents, opened its doors to those fleeing to safety.

“It was chaos, panic and terror,” a front desk employee said. “Scariest thing I can recall.”

Suspected teen gunman Jaylen Dwayne Edgar is seen walking through the crowded streets in a yellow shirt and backpack before he started shooting, sending costumed revelers fleeing for their lives, harrowing video released by the Orlando Police Department Friday showed.

At least two people were killed, and six others were wounded in the mass shooting, police said.

Edgar allegedly attempted to flee the scene but a police officer who saw him pull the trigger immediately tackled him to the ground by himself before three other cops pounced on him.

During an early-morning press conference, Orlando Police Chief Eric Smith said that Florida’s new constitutional carry law has changed how officers keep the area safe.

“We used to do closures, and we had the dogs and all that,” Smith said. “That all went away when the law changed, and basically, you can carry a weapon on a public street as long as you meet certain criteria. So when that changed, we can no longer do that.”

“We could no longer do the dogs (that) we had downtown,” Smith continued.

“We are working with the city, working with the clubs downtown to figure out if there’s something else we can go to, to keep it secure down there. With that many people down there, we have no idea what people have on their person.”

A motive has not yet been announced, and the victims’ names have not been released. It’s unclear if Edgar has hired an attorney authorized to speak on his behalf.