The new video, posted on X on Thursday by US Attorney for Washington DC Jeanine Pirro, appears to be a higher quality version of a clip shared by Trump on social media in the aftermath of Saturday’s incident.
The latest footage shows nearly a dozen security agents gathered around a security checkpoint at the hotel.
A man wearing a long dark coat walks through the corridor and disappears into a doorway.
A moment later the gunman, having shed his coat, re-emerges and sprints through a metal-detector with both hands on what appears to be a gun.
His coat was concealing a 12-gauge shotgun, according to an affidavit, external filed by prosecutors.
The footage appears to show an officer fire his handgun at the suspect. Prosecutors have said the agent was hit by gunfire, but the alleged assailant was not shot.
A Secret Service spokesman told the BBC on Thursday: “The officer was struck in the ballistic vest, but was not seriously injured.”
Ballistics experts have been investigating whether the Secret Service officer was hit by a bullet fired by the suspect, or by other law enforcement at the scene.
Pirro said in Thursday’s post on X: “There is no evidence the shooting was the result of friendly fire.”
However, a memo filed by prosecutors on Wednesday, asking a judge to hold Allen in custody pending trial, makes no mention of any officer being shot.
It says that as the suspect ran through the checkpoint, a Secret Service officer “observed the defendant fire the shotgun in the direction of the stairs leading down to the ballroom”.
Earlier statements in charging documents alleged that one officer was hit in the ballistic vest by a single shot fired by the suspect.
Defence lawyers for Allen have questioned prosecutors’ claims that their client opened fire.