BUTLER, Pa. — (WPXI) – Channel 11 News uncovered dramatic new details Monday in the moments leading up to the assassination attempt on former president Donald Trump. According to multiple law enforcement sources, 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. Channel 11’s Nicole Ford confirmed that Beaver County’s ESU team had eight members at the rally, including snipers and spotters. According to Ford’s sources, one of them noticed a suspicious man on a roof near the rally at 5:45 p.m., called it in and took a picture of the person. We have learned from our sources the person in that picture is Thomas Crooks. We’re told it’s not clear if Crooks had a gun with him at that point. According to multiple sources, a law enforcement officer had also previously seen Crooks on the ground and called him in as a suspicious person with a picture prior to 5:45 p.m. Our sources tell us an officer checked the grounds for Crooks at that point, but did not see him where the first picture was taken. 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.