A federal agent who launched the investigation that ultimately led to the resignation of Central Intelligence Agency chief David Petraeus was barred from taking part in the case over the summer due to superiors' concerns that he was personally involved in the case, according to officials familiar with the probe.

After being blocked from the case, the agent continued to press the matter, relaying his concerns to a member of Congress, the officials said.

New details about how the Federal Bureau of Investigation handled the case suggest that even as the bureau delved into Mr. Petraeus's personal life, the agency had to address conduct by its own agent—who allegedly sent shirtless photos of himself to a woman involved in the case prior to the investigation.

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