Hillary Clinton appears to have overcome an investigation of her role in the 2012 deadly attacks in Benghazi, Libya, but she still faces a months-long FBI inquiry into the handling of sensitive information while she was secretary of state.

The FBI's Counterintelligence Division, which opened its review this summer after classified information was found in emails transmitted over Clinton's private email server, is under pressure to act quickly, as Clinton is in the midst of running for the Democratic nomination for president in 2016.

Attorneys who have handled classified information cases say the bureau, initially asked to examine whether Clinton's arrangement compromised national security secrets, ultimately will have to consider whether she and her aides failed to sufficiently safeguard sensitive information.