Tahawwur Rana, the mastermind behind the 26/11 Mumbai terror attacks, has been successfully extradited to India, the National Investigation Agency (NIA) announced on Thursday. Calling Rana the "key conspirator behind the 2008 mayhem", NIA said, "Extradition finally came through after Rana exhausted all legal avenues." US' Supreme Court had recently denied Rana's plea against extradition.