US President Donald Trump and the ⁠head of the Secret Service said on Thursday that the federal agent injured during the attack at the White House Correspondents’ Association dinner had not been hit by friendly fire, as authorities released a video of the incident.

Jeanine Pirro, the top federal prosecutor for Washington, posted the footage on social media, saying it showed the suspect shooting the US Secret Service officer as he ran through security towards the gala packed with journalists,...