A four-member team of Indian investigators will leave for the US tomorrow to interrogate David Headley, who is accused of helping Lashkar-e-Taiba terrorists to carry out the 26/11 Mumbai attacks.<br/><br/>Three officers of National Investigation Agency and a law officer will travel to Chicago and are expected to interrogate Headley next week.<br/><br/>A Chicago-based American, Headley, with roots in Pakistan, has already confessed to have conducted several reccees as part of the planning for the ghastly attacks that killed 166 people in the country's financial capital in November 2008.<br/><br/>After his arrest in October last year, the 49-year old Headley entered into a plea bargain with the US government in March this year, when he offered to be available to foreign investigators through deposition, video conferencing.