Washington, May 2 -- The US Department of Justice on Thursday released video footage of the man accused of trying to assassinate President Donald Trump last weekend as he charged through a hotel security checkpoint and shot a Secret Service officer. Jeanine Pirro, US attorney for the District of Columbia, said on X that the security footage also showed suspect Cole Tomas Allen "casing the area" in the Washington Hilton during the day before Saturday's attack at an annual media gala in the capital. The nearly six-minute video features several clips of a man walking back and forth down a corridor, and through a fitness centre. A more dramatic excerpt shows the man, carrying what appears to be a long-barrelled gun, charging through a security checkpoint past uniformed police and agents in suits. Pirro said the video shows "Cole Allen shoot a US Secret Service officer during his attempt to assassinate the President at the White House Correspondents' Dinner". "There is no evidence the shooting was the result of friendly fire," she said, adding that the video had already been provided to the US District Court. The footage appears to show a Secret Service agent discharging his weapon three times in the direction of the assailant, although police have stressed that Allen was not shot during the attack. In a slow-motion clip released by the justice department, white circles are placed around one agent's weapon at the three moments in which muzzle blasts are seen from the firearm. Allen, 31, was tackled and detained in a chaotic scuffle with security guards. Shots were fired but no one was killed. His capture does not feature in the video released on Thursday, and it was not immediately clear from the footage who was shot. Allen, from the state of California, was charged in court Monday with trying to assassinate the Republican president. He faces up to life in prison if convicted. The head of the Secret Service said on Thursday the federal agent injured during the attack at the White House Correspondents' Association dinner had not been hit by friendly fire. US Secret Service director Sean Curran said in a Thursday Fox News interview that one agent was shot at "point-blank range" by the suspect as he ran through a security checkpoint near the dinner on Saturday. "Our officer heroically returned fire," Curran said on "The Will Cain Show", adding the agent fired five times. The suspect was not hit by the agent's fire, Curran said, but fell to the ground after hitting his knee. The suspect was subdued by other federal agents near the top of the stairs leading to the ballroom where Trump, the first lady, top administration officials and hundreds of others dined, he said. A US law enforcement official also told Reuters on Thursday that an investigation had concluded the Secret Service agent was not hit by "friendly fire." Allen, 31, sprinted through a security checkpoint at the Washington Hilton hotel on Saturday attempting, prosecutors allege, to assassinate Trump....