BUTLER, Pennsylvania — New details have been uncovered Monday in the moments leading up to the assassination attempt on former President Donald Trump, according to our sister station in Pittsburgh, WPXI-11 .
>>RELATED: Trump assassination attempt: Secret Service says it did not sweep building where gunman was located
Watch News Center 7 at 5:00 p.m. and 6:00 p.m. for the latest on the investigation into the assassination attempt and new information about the surviving victims.
Thomas Crooks was spotted by law enforcement on a roof nearly 30 minutes before shots were fired that injured Trump, killed a former fire chief, and injured two others in the crowd.
Beaver County’s ESU team had eight members at the rally, including snipers and spotters, WPXI-11′s Nicole Ford confirmed .
One of them noticed a suspicious man on a roof near the rally at 5:45 pm, called it in and took a picture of the person.
WPXI-11′s sources confirmed the person in that picture is Thomas Crooks. It is not clear if Crooks had a gun with him at that point.
>>RELATED: A timeline of the assassination attempt on former President Trump
A law enforcement officer had also previously seen Crooks on the ground and called him in as a suspicious person with a picture before 5:45 p.m.
An officer checked the grounds for Crooks but did not see him, according to WPXI-11′s sources.
26 minutes after the second picture of Crooks was taken by law enforcement and the information called in, shots were fired from the roof of the American Glass Research building.
Seconds later, a Secret Service sniper returned fire and killed Crooks.
We will continue to follow this story.
Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Republican presidential candidate, former U.S. President Donald Trump arrives for a rally at Butler Farm Show Inc. on July 13, 2024 in Butler, Pennsylvania. Shortly after, shots rang out and Trump slumped before being whisked away by Secret Service with injuries visible to the side of his head. Butler County district attorney Richard Goldinger said the shooter and one audience member are dead and another was injured. (Photo by Jeff Swensen/Getty Images) (Jeff Swensen/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Supporters of Republican presidential candidate, former U.S President Donald Trump wait for the start of a campaign rally at Butler Farm Show Inc. on July 13, 2024 in Butler, Pennsylvania. Shortly after Trump began to speak, shots rang out and the former president slumped before being whisked away by Secret Service with injuries visible to the side of his head. Butler County district attorney Richard Goldinger said that the shooter and one audience member are dead and another was injured. (Photo by Jeff Swensen/Getty Images) (Jeff Swensen/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Republican presidential candidate, former U.S. President Donald Trump is swarmed by Secret Service after gunshots rang out at a rally at Butler Farm Show Inc. on July 13, 2024 in Butler, Pennsylvania. Trump slumped before being whisked away with injuries visible to the side of his head. Butler County district attorney Richard Goldinger said the shooter and one audience member are dead and another was injured. (Photo by Jeff Swensen/Getty Images) (Jeff Swensen/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Republican presidential candidate, former U.S. President Donald Trump is whisked away by Secret Service after shots rang out at a campaign rally at Butler Farm Show Inc. on July 13, 2024 in Butler, Pennsylvania. Trump slumped and injuries were visible to the side of his head. Butler County district attorney Richard Goldinger said the shooter and one audience member are dead and another was injured. (Photo by Jeff Swensen/Getty Images) (Jeff Swensen/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Republican presidential candidate, former U.S. President Donald Trump is whisked away by Secret Service after shots rang out at a campaign rally at Butler Farm Show Inc. on July 13, 2024 in Butler, Pennsylvania. Trump slumped and injuries were visible to the side of his head. Butler County district attorney Richard Goldinger said the shooter and one audience member are dead and another was injured. (Photo by Jeff Swensen/Getty Images) (Jeff Swensen/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Republican presidential candidate, former U.S. President Donald Trump is whisked away by Secret Service after shots rang out at a campaign rally at Butler Farm Show Inc. on July 13, 2024 in Butler, Pennsylvania. Trump slumped and injuries were visible to the side of his head. Butler County district attorney Richard Goldinger said the shooter and one audience member are dead and another was injured. (Photo by Jeff Swensen/Getty Images) (Jeff Swensen/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Republican presidential candidate, former U.S. President Donald Trump is whisked away by Secret Service after shots rang out at a campaign rally at Butler Farm Show Inc. on July 13, 2024 in Butler, Pennsylvania. Trump slumped and injuries were visible to the side of his head. Butler County district attorney Richard Goldinger said the shooter and one audience member are dead and another was injured. (Photo by Jeff Swensen/Getty Images) (Jeff Swensen/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Republican presidential candidate, former U.S. President Donald Trump is whisked away by Secret Service after shots rang out at a campaign rally at Butler Farm Show Inc. on July 13, 2024 in Butler, Pennsylvania. Trump slumped and injuries were visible to the side of his head. Butler County district attorney Richard Goldinger said the shooter and one audience member are dead and another was injured. (Photo by Jeff Swensen/Getty Images) (Jeff Swensen/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Attendees duck from gunfire at a campaign rally for Republican presidential candidate, former U.S. President Donald Trump at Butler Farm Show Inc. on July 13, 2024 in Butler, Pennsylvania. Trump slumped before being whisked away by Secret Service with injuries visible to the side of his head. Butler County district attorney Richard Goldinger said the shooter and one audience member are dead and another was injured. (Photo by Jeff Swensen/Getty Images) (Jeff Swensen/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Attendees scatter after gunfire rang out during a campaign rally for Republican presidential candidate, former U.S. President Donald Trump at Butler Farm Show Inc. on July 13, 2024 in Butler, Pennsylvania. Trump slumped before being whisked away by Secret Service with injuries visible to the side of his head. Butler County district attorney Richard Goldinger said the shooter and one audience member are dead and another was injured. (Photo by Jeff Swensen/Getty Images) (Jeff Swensen/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Attendees scatter after gunfire rang out during a campaign rally for Republican presidential candidate, former U.S. President Donald Trump at Butler Farm Show Inc. on July 13, 2024 in Butler, Pennsylvania. Trump slumped before being whisked away by Secret Service with injuries visible to the side of his head. Butler County district attorney Richard Goldinger said the shooter and one audience member are dead and another was injured. (Photo by Jeff Swensen/Getty Images) (Jeff Swensen/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Law enforcement agents stand near the stage of a campaign rally for Republican presidential candidate former President Donald Trump on July 13, 2024 in Butler, Pennsylvania. According to Butler County District Attorney Richard Goldinger, the suspected gunman is dead after injuring former President Trump, killing one audience member and injuring at least one other. (Photo by Anna Moneymaker/Getty Images) (Anna Moneymaker/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Campaign signs and empty water bottles are seen on the ground of a campaign rally for Republican presidential candidate former President Donald Trump on July 13, 2024 in Butler, Pennsylvania. According to Butler County District Attorney Richard Goldinger, the suspected gunman is dead after injuring former President Trump, killing one audience member and injuring at least one other. (Photo by Anna Moneymaker/Getty Images) (Anna Moneymaker/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Law enforcement agents stand near the stage of a campaign rally for Republican presidential candidate former President Donald Trump on July 13, 2024 in Butler, Pennsylvania. According to Butler County District Attorney Richard Goldinger, the suspected gunman is dead after injuring former President Trump, killing one audience member and injuring at least one other. (Photo by Anna Moneymaker/Getty Images) (Anna Moneymaker/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Campaign signs and empty water bottles are seen on the ground of a campaign rally for Republican presidential candidate former President Donald Trump on July 13, 2024 in Butler, Pennsylvania. According to Butler County District Attorney Richard Goldinger, the suspected gunman is dead after injuring former President Trump, killing one audience member and injuring at least one other. (Photo by Anna Moneymaker/Getty Images) (Anna Moneymaker/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Campaign signs and empty water bottles are seen on the ground of a campaign rally for Republican presidential candidate former President Donald Trump on July 13, 2024 in Butler, Pennsylvania. According to Butler County District Attorney Richard Goldinger, the suspected gunman is dead after injuring former President Trump, killing one audience member and injuring at least one other. (Photo by Anna Moneymaker/Getty Images) (Anna Moneymaker/Getty Images) Trump attempted assassination BUTLER, PENNSYLVANIA - JULY 13: Law enforcement agents stand near the stage of a campaign rally for Republican presidential candidate former President Donald Trump on July 13, 2024 in Butler, Pennsylvania. According to Butler County District Attorney Richard Goldinger, the suspected gunman is dead after injuring former President Trump, killing one audience member and injuring at least one other. (Photo by Anna Moneymaker/Getty Images) (Anna Moneymaker/Getty Images) ©2024 Cox Media Group