MACON, Ga. (The Blaze/AP) — A central Georgia fire chief says five of the seven firefighters seen in a prank video showing a gunman were in on it, and two rookies were not.

The video, titled “Rookie prank,” shows a masked man bursting into a fire station and threatening firefighters with a gun. It was posted Sunday on YouTube.

[Content Warning: Contains graphic language]

The Telegraph of Macon reports (http://bit.ly/pFWFLV ) that Macon-Bibb County Fire Chief Marvin Riggins said he expects disciplinary action will be taken by Wednesday.

Riggins said he’s appalled by the video, which shows scared firefighters face-down on the ground as a man with a yellow bandana over his face waves a gun. At one point, the gunman leads a firefighter away from his spot on the ground. Moments later, the sound of a gunshot is heard.

“This is where the line is drawn,” Riggins said of the “prank that got out of hand.”

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