 This is a gunman whose phone is apparently inaccessible to the FBI at this hour, but they're completely sure he acted all by himself. Now, hearing those facts, you might conclude that somehow this 20-year-old had managed to elude detection by Trump's protective detail until he was able to open fire. But that's not true. The Secret Service and local authorities were aware of the gunman long before he climbed on the roof. Quoting from CNN,