WASHINGTON (AP) — Federal prosecutors released a video Thursday showing the moment authorities say a man armed with guns and knives tried to storm the White House Correspondents' Association dinner and attempt to kill President Donald Trump.

Watch a clip of the footage in the video player above.

Jeanine Pirro, the U.S. attorney for Washington, posted the video on social media amid questions over whose bullet struck a Secret Service officer as Cole Tomas Allen ran through security with a long gun toward the hotel ballroom packed with journalists, administration officials and others.

READ MORE: Fact-checking misinformation about the Correspondents' Dinner shooting

Prosecutors had previously claimed the agent was shot in the bullet-resistant vest during the melee, but had not confirmed it was Allen who shot the agent. Pirro, however, said Thursday that there is no evidence that the officer was hit by friendly fire.

The video appears to show Allen run through a magnetometer and point his weapon at the agent, who fired back five times, according to authorities. It's not clear from the video at what moment Allen's weapon fires.

Watch the full video footage below.

Allen was injured but was not shot during the Saturday night attack at the Washington Hilton, which disrupted one of the highest-profile annual events in the nation's capital.

Allen agreed earlier Thursday to remain jailed while he awaits trial. He did not enter a plea during his brief appearance in federal court.

WATCH: Accused Correspondents' Dinner gunman charged with attempted assassination of Trump

Secret Service Director Sean Curran defended the agency's security plan for the event and said he would not change it. He said in a Fox News interview that the attack was stopped within seconds at the outermost perimeter of a multi-layered security bubble around the president. The distance from the magnetometers to the podium where Trump was seated was 355 feet, with two sets of stairs, a doorway and many more armed Secret Service officers in between, he said.

"The site was set up perfectly," Curran said.

The nearly six-minute video released by Pirro shows Allen walking back and forth down a hallway the day before the attack, and briefly checking out the hotel gym. Footage from the security checkpoint shows about a dozen federal officers taking down magnetometers and casually standing around when the gunman emerges from a doorway and starts sprinting toward them. The gunman quickly reaches the officers before most of them appear to notice him.

WATCH: Liz Landers and Lisa Desjardins describe chaos at Correspondents' Dinner shooting

Only one officer visible in the video appears to have drawn his gun before the gunman passed; Pirro said he's the one who was shot and returned fire.

In court papers pressing for Allen's continued detention, prosecutors wrote Wednesday that Allen took a picture of himself in his hotel room just minutes before the incident, and that he was outfitted with an ammunition bag, a shoulder gun holster and a sheathed knife. In a message that authorities say sheds light on his motive, Allen referred to himself as a "Friendly Federal Assassin" and alluded obliquely to grievances over a range of Trump administration actions.

Allen's lawyers agreed during the brief hearing before U.S. Magistrate Moxila Upadhyaya to keep their client behind bars for now after initially arguing in court papers that Allen should be released.

In a court filing Wednesday, the defense wrote that the government's case is "based upon inferences drawn about Mr. Allen's intent that raise more questions than answers" and noted that Allen's writings never mentioned Trump by name. The defense left the door open to pressing in the future for Allen's release before trial.

WATCH: Ex-agent weighs in on Secret Service security concerns

"The government's evidence of the charged offense — the attempted assassination of the president — is thus built entirely upon speculation, even under the most generous reading of its theory," defense lawyers wrote.

Allen was charged on Monday with that crime, as well as two additional firearms counts, including discharging a weapon during a crime of violence. He faces up to life in prison if convicted of the assassination count alone.

Allen, 31, is from Torrance, California. He worked as a part-time tutor for a test preparation company and is an amateur video game developer.

Associated Press writer Jonathan J. Cooper in Phoenix contributed.