One spectator was killed and two were hurt in the shooting on July 13.
Federal authorities are investigating after former President Donald Trump was shot in the ear in an assassination attempt at an election rally in Butler, Pennsylvania, on July 13.
The alleged shooter was killed by snipers. One spectator was killed and two were hurt, officials said.
Law enforcement sources tell ABC News that the FBI is currently in possession of three firearms from Saturday’s shooting and defense of the former president.
The firearms include one belonging to the shooter, one belonging to the Secret Service agent who shot and killed the shooter and the other belonging to a Butler County Sheriff’s Deputy who was involved in the shooting.
-ABC News' Luke Barr
The assassination attempt on former President Donald Trump "will likely be amplified in extremist messaging and heavily exploited by malicious actors," according to an NYPD intelligence product obtained by ABC News.
The misinformation surrounding the attack is "aimed at fomenting division," according to the Sunday bulletin.
"In the immediate hours after the shooting took place, multiple users on numerous online messaging platforms responded to the incident with support for the attack, overt calls for civil war, hostile rhetoric against FPOTUS Trump, threats against elected officials and generalized calls for retaliatory violence," according to the bulletin.
Sources have said there has been an uptick in threats to elected officials around the country as a result of the attack.
-ABC News' Luke Barr
Donald Trump's plane landed at Milwaukee International Airport Sunday evening ahead of the Republican National Convention.
Trump’s highly anticipated appearance at the RNC on Monday comes just two days after the assassination attempt of him at Saturday's campaign rally in Pennsylvania.
Authorities outside the security perimeter of Donald Trump's campaign event Saturday were alerted there was a man acting suspiciously before the shooting.
Local and state police, responsible for security outside that perimeter, began to search for a potential suspect, multiple sources briefed on the probe tell ABC News.
Within minutes, law enforcement spotted the suspected gunman on the roof, sources said.
It is unclear as of now, according to sources, whether this information was passed along to the U.S. Secret Service, which is responsible and focused on the security of the former president and the crowed inside the security zone.
A police officer saw the suspect on a rooftop and attempted to make it to the roof to engage the shooter, police sources said.
That officer was threatened when the gunman pointed his rifle at the cop, according to sources, who add that effort did not succeed as, moments later, shots rang out, targeting Trump.
-ABC News' Josh Margolin
