<br/>US has refused to make any remarks on the revelations made by Pakistani-American terrorist David Coleman Headley to Indian investigators, on ISI's involvement in the Mumbai terror attack. State Department spokesman, P J Crowley told reporters in Washington that anything said on the issue would either compromise intelligence information or an ongoing legal investigation. <br/><br/>A four member team of the National Investigation Agency (NIA) in June had done a week-long interrogation and questioning of Headley who pleaded guilty to conspiring in the 26/11 Mumbai attacks that killed 166 persons. The NIA team headed by investigator Loknath Behera was granted access to Headley, at the request of the Indian Government, when the Federal Bureau of Investigation found that the Pakistani-American LeT operative Headley was involved in planning the Mumbai terror attack.