New Delhi, Oct. 31 -- The National Investigation Agency (NIA) has sent a request to the US seeking additional details in its probe against 26/11 Mumbai attacks co-conspirator Tahawwur Hussain Rana based on his interrogation in India, people familiar with the development said on Thursday. A formal request, seeking certain specific details on Rana, has been sent through mutual legal assistance treaty (MLAT). An officer who didn't want to be named said although a supplementary charge sheet was filed in the case in July this year but "we needed some more information based on his interrogation as the investigations are continuing". Rana, who is currently lodged in Tihar prison here, had been interrogated in detail following his extradition from the US on April 10 this year. On November 26, 2008, a group of 10 Pakistani terrorists sneaked into Mumbai through the sea route, and went on a rampage, killing 166 people....