The FBI is still trying to determine a motive behind Saturday's attempt to assassinate former President Donald Trump , while the tone of this week's Republican convention in Milwaukee likely will be dominated by the violence. A former fire chief who was killed at Trump's Pennsylvania rally is being remembered as a “man of conviction." The shooting wounded two other men and pierced the upper part of Trump’s ear with a bullet.

The 20-year-old who authorities say carried out the attack is believed to have acted alone with his father's gun. Here’s a look at what we know so far about the attempt on Trump's life and its aftermath: Officials say Thomas Matthew Crooks, 20, of Bethel Park, Pennsylvania — about 50 miles (80 kilometers) from the shooting — came to law enforcement attention when spectators at the Trump rally noticed him acting strangely outside the event. Police had a report of a suspicious man pacing near the magnetometers and were apparently exchanging photos of the suspect.

Witnesses pointed and shouted at an armed man on a nearby roof. When a police officer climbed up to the roof to investigate, the gunman turned and pointed his rifle at him. But the officer did not — or could not — fire a single shot.

A sniper cut down Crooks within seconds of him firing an AR-style rifle toward the former president, but it was too late. Trump was showing off a chart of border crossing numbers when the gunfire began . As the first pop went off Trump said, “Oh,” the.