A four-member team of Indian investigators will leave for the US tomorrow to interrogate David Headley, who is accused of helping out Lashkar-e-Taiba terrorists carry out the 26/11 Mumbai attacks. Three officers of National Investigation Agency (NIA) and a law officer will travel to Chicago and are expected to interrogate Headley next week. Official sources said that the team is being sent following a communication from the US Justice Department that all concerned officials will be available during the visit of the Indian team to facilitate their access to Headley. <br/> <br/>A Chicago-based American, Headley, with roots in Pakistan, has already confessed to have conducted several recess as part of the planning for the ghastly attacks that killed 166 people in the country's financial capital in November 2008. After being arrested in October last year, the 49-year old entered into a plea bargain with the US government in March this year, wherein he offered to be available to foreign investigators through deposition, video conferencing or letters rogatory. <br/>