US considering immunity for key MF Global witness

The New York Post reports:

Federal law enforcement authorities investigating the implosion of MF Global say the likelihood of a criminal prosecution in the case has grown in recent weeks, as investigators actively discuss providing immunity to a key witness who could provide details about who was responsible for the transfer of money out of customer accounts during the brokerage firm's final frantic days.

People with direct knowledge of the investigation say that in recent days federal law enforcement authorities have held high-level discussions about granting immunity from prosecution to former MF Global assistant treasurer Edith O'Brien in exchange for her cooperating in the probe.