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Two police officers phoned into a "blanket tactical channel" to alert that an armed individual was on the roof moments before Trump was shot at the PA rally.
Butler town manager Tom Knights says that the local police officer who "interrupted" Thomas Crooks was hanging from the roof after being lifted up by an officer.
Crooks then pointed his rifle at the officer which then forced him to fall.
The officer who fell and the officer who was holding him, radioed into a "blanket tactical channel" to notify that an armed individual was on the roof.
Knights said there has been no direct communication with members of the Secret Service to Butler officials.
It's unclear how much time was between Crooks pointing his rifle at the officer and when the first shot rang out.