Incident officially being investigated as assassination plot: Senior official
The shooting at the Trump rally is officially being investigated as an assassination plot on Trump, a senior defense official told ABC News.
Early evidence indicates that there was only one shooter, according to the source.
Attorney General Merrick Garland said in a statement that the FBI; Bureau of Alcohol, Tobacco, Firearms and Explosives; U.S. Attorney's Office for the Western District of Pennsylvania; and the Department's National Security Division will be involved in the investigation.
"My heart is with the former President, those injured, and the family of the spectator killed in this horrific attack," he said in a statement. "We will not tolerate violence of any kind, and violence like this is an attack on our democracy. The Justice Department will bring every available resource to bear to this investigation."