A Florida boy aged just 14 has been arrested on gun charges in connection to a mass shooting that killed two people — including another teen of the same age — and injured 16 others, police said.

Thursday’s arrest in Tampa was the second tied to the Oct. 29 carnage during a Halloween celebration in Tampa’s Ybor City that killed Harrison Boonstoppel, 20, and a 14-year-old boy identified by his father as Elijah Wilson.

The young teen — not identified because of his age — was busted on counts of being a minor in possession of a firearm while wearing a mask as well as carrying a concealed firearm.

“There is no reasonable explanation for a 14-year-old to be in possession of a firearm,” Tampa Police Chief Lee Bercaw said in a press conference.

“I am incredibly proud of the hard work our officers and detectives continue to dedicate to this investigation, which has led to another significant arrest in the case.”

Police previously said at least two people opened fire during an early-hours brawl in a popular area where bars and restaurants had just closed.

As well as the two killed, 16 others — ranging in age from 18 to 27 — were injured. Most have since been treated and discharged from the hospital, reported Bay News 9.

Tyrell Phillips, 22, was previously arrested on a charge of second-degree murder in the killings. He was being held without a bond.

The 14-year-old arrested this week was spotted displaying a gun before fleeing the scene on the night of the bloodshed.

He was being held in Palm Beach County pending his return to Tampa.

Chief Bercaw hailed the teen suspect’s arrest as a “great development.”

“And this is one step forward in this case, and it shows that we are going to take swift and immediate action,” Tampa’s top cop added.

Police are still searching for seven “persons of interest” who were seen in a surveillance video taken at the scene of the shooting.

“And this is one step forward in this case, and it shows that we are going to take swift and immediate action,” Tampa’s top cop added.

“You’re not going to get away with it,” Bercaw warned in a message to the culprits. “It’s unacceptable, and we’re here taking swift action.”

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