The summary of an internal investigation determined that the agency did not adequately prepare its local partners for their duties at the event in Butler, Pa., in July.

The agency's director cites a failure to secure the building the shooter fired from among a litany of security failures.

WASHINGTON (Reuters) - A U.S. Secret Service probe found communication gaps and a lack of diligence ahead of the July 13 shooting at a rally of Republican presidential candidate Donald Trump in Butler, Pennsylvania, in which the former president was shot and a rally attendee was killed.

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