Gunman at Trump rally flew drone over fairgrounds earlier on day of shootings

Latest disclosure about security lapses comes as larger picture of Thomas Matthew Crooks' preparations emerges

Thomas Matthew Crooks, the gunman who tried to assassinate Donald Trump a week ago, was able to fly a camera-equipped drone over the fairgrounds near Butler, Pennsylvania, shortly before the former president was set to speak there, according to news reports.

The latest disclosure about security lapses that preceded the shooting comes as a more complete picture of Crooks' preparations is emerging, though it still lacks any definitive motive for the 20-year-old's actions that led to Trump being grazed by a bullet, the shooting death of former fire chief Corey Comperatore and the critical wounding of two rally-goers.