New Delhi, April 11 -- The 26/11 Mumbai attacks accused Tahawwur Rana will remain in the custody of the National Investigation Agency (NIA) for 18 days, where he will be questioned in detail about the "complete conspiracy" behind the deadly 2008 attacks, said the agency.

Tahawwur Rana was brought to the National Investigation Agency headquarters on late Thursday.

NIA said that Rana will remain in NIA custody for 18 days, during which time the agency will question him in detail in order to unravel the complete conspiracy behind the deadly 2008 attacks, in which a total of 166 persons were killed and over 238 injured.

The 26/11 Mumbai attacks accused Tahawwur Hussain Rana on Thursday arrived in India following his extradition by the Unit...