VIDEO is released: The moment when Secret Service agents execute the author of the assassination attempt on Trump

After the assassination of Donald Trump, a new video published in the media shows the moment when Secret Service agents shot the gunman on a roof hundreds of meters away.

Footage shows agents on top of a building above the rally scene in Butler, Pennsylvania, as they fire in the direction of the gunshots.

Seconds later, the alleged perpetrator was executed by a sniper of Donald Trump's security. He was identified as Thomas Matthew Crooks, 20, of Bethel Park, Pennsylvania.

Referring to the local media, Crooks is identified as a Republican, while the causes of this attempted assassination still remain a mystery.

The FBI has asked for the help of citizens to help in the investigation for the full disclosure of this armed attack. Trump has spoken after the gun attack saying that "he will never surrender".