US President Donald Trump and 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, as authorities released a video of the incident.

Jeanine Pirro, the US Attorney for the District of Columbia, posted the nearly six-minute video on social media amid lingering questions over whose bullet struck the officer.

Pirro noted that the security footage captured suspect Cole Tomas...