New footage shows how Trump dinner gunman charged through security in four seconds

New footage released by prosecutors shows the four chaotic seconds when a gunman burst from a hotel doorway and charged through a security checkpoint as President Donald Trump was attending a press gala.

The CCTV video appears to show a security agent opening fire on the sprinting gunman, who raises a long-barrelled weapon. It is unclear from the clip if the suspect's firearm is discharged.

The clip does not show the bit where the alleged attacker fell over and was arrested on Saturday at the Washington Hilton, as investigators have recounted.

Cole Tomas Allen, 31, has pleaded not guilty to attempting to assassinate President Trump at the White House Correspondents' Association dinner.

The US justice department says the video also shows Allen "casing the area" at the hotel, on the day before the dinner was held in a basement ballroom there.

Prosecutors say the defendant checked into the hotel as a guest one day before the attack.

The accused was able to run about 60ft (18m) down the hotel corridor before he was tackled, according to Acting US Attorney Todd Blanche.

In charging documents, officials say one officer was hit in the ballistic vest by a single shot fired by the suspect.

That same officer "drew his service weapon and fired multiple times" at Allen, who was not struck by the officer's bullets, said Blanche.