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Petraeus has been married for 37 years and said "such behavior is unacceptable." Petraeus retired from the Army as a four-star general to become the CIA chief in September of 2011.

The FBI says there are strong preliminary indications that the killing of a Border Patrol agent earlier this week was accidental. Melissa Block talks with NPR's Ted Robbins about the ongoing investigation of the shooting along the Arizona-Mexico border.

Law enforcement officials said there's a possibility the agents fired at each other thinking others were firing on them.

Three weeks after the attack on the U.S. consulate that left U.S. Ambassador Chris Stevens and three other Americans dead, a team of FBI investigators got to the site in Libya.

Richard Aoki, an early member of the Black Panther Party, gave the Panthers their first guns. He was a former soldier, a militant radical...and an FBI informant.

The FBI alleges Tony Mack accepted thousands in exchange for influence over a construction project.

The attack at a Sikh temple by a gunman with ties to white supremacists has raised questions about domestic terrorism — and what law enforcement is doing to stop it. In recent years, the Internet, the worsening economy and changing demographic patterns have given new voice to hate groups.

Officials say the FBI didn't open a formal investigation into Wade Michael Page about six years ago because he didn't seem to be a threat.

Many players were left hanging when the FBI shutdown three online poker sites last year. Now, a deal means they'll get their money back.

The revelation is one more in series of questionable NYPD surveillance after Sept. 11.