US federal prosecutors have released interrogation tapes of admitted Pakistani-American terrorist David Headley, who helped plot the November 2008 Mumbai terror attacks, after a Chicago judge's order.

Wednesday's release of the Federal Bureau of Investigation (FBI) tape came after a not for profit investigative journalism group, Pro-Publica, filed a court motion along with the PBS show Frontline.

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In the tapes, Headley is shown confessing that he took training in LeT camps and under ISI and Pakistani militants linked to Al Qaeda and accepted his role in scouting targets and conducting a recce of Mumbai before the 2008 attacks.

Headley was accused in scouting targets and conducting a recce in Mumbai before 26/11 attacks that led to the death of 166 people including six Americans. Headley testified to US authorities on conditions that he be not extradited to India and not be given the death penalty.