Police Spotted Trump Rally Shooter 30 Minutes Before Attack

TL;DR
A sniper assisting the U.S. Secret Service at a Trump rally took a picture of the gunman, Thomas Matthew Crooks, and saw him using a rangefinder before the assassination attempt. Despite alerting the command post, Crooks managed to position himself and began firing into the crowd, killing a firefighter and injuring Trump and two others. A Secret Service sniper ultimately killed Crooks. The FBI has accessed the shooter's cell phone, and security at the rally is under heavy criticism.
- Sniper took picture of Trump rally shooter, saw him use rangefinder before assassination attempt, source says CBS News
- Police were stationed in building Trump gunman Thomas Matthew Crooks shot from BBC.com
- Police snipers were inside building as Trump rally shooter fired from roof above The Washington Post
- Officer reported man at Trump rally with range-finder 30 mins before assassination attempt: source Fox News
- Law enforcement spotted Trump shooter nearly 30 minutes before shots fired, NBC affiliate reports Reuters.com
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