The suspect in the shooting was killed at Silver Rail Elementary in Bend, Ore., according to the authorities, and the conditions of the injured were not immediately known.

The president’s allies have sought to prove a “grand conspiracy” through a sprawling Justice Department inquiry. It has buckled under staffing shake-ups, internal disputes and trouble finding evidence.

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The civil rights unit has recruited people whose questionable work histories and dearth of education and experience might have disqualified them in the past, former officials said.

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