New Delhi, April 10 -- The National Investigation Agency (NIA) on Thursday evening formally arrested Tahawwur Hussain Rana, the key conspirator in the deadly 26/11 Mumbai terror attacks, immediately after his arrival at Indira Gandhi International Airport (IGIA), New Delhi, following his successful extradition from the United States, the agency said.

NIA had secured Rana's extradition following years of sustained and concerted efforts and after the terror mastermind's last-ditch efforts to get a stay on his extradition from the US failed.

Rana was escorted to New Delhi by teams of National Security Guard (NSG) and NIA, comprising senior officials, on a special plane from Los Angeles, United States. The NIA investigation team at the airp...