(CBS News) CBS News has learned that multiple new whistleblowers are privately speaking to investigators with the House Oversight and Government Reform Committee regarding the Sept. 11, 2012 terrorist attacks on the U.S. compounds in Benghazi, Libya.

The nature of the communications with the whistleblowers and their identities are not being made public at this time. But in response, the Oversight Committee yesterday sent letters to the three federal agencies involved: the CIA, the Defense Department and the State Department.

The letters make the case for the whistleblowers to be able to share sensitive or classified information with their own attorneys, and ask for each agency’s official description of the legal steps that process must follow. The letters also state that additional witnesses may be “compelled by subpoena to give testimony.”

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