He was served a third summon recently in which he was given an assurance that the NIA would ensure complete security to him.
He had been asked to appear before the NIA on March 11 and March 18 but the Mirwaiz had expressed his inability to join the investigation in the national capital fearing for his security.
The NIA had earlier questioned two maternal uncles of the Mirwaiz — Maulvi Manzoor and Maulvi Shafat — and his close aides last year. Both Manzoor and Shafat are retired senior government officers.
The NIA had on February 26 carried out searches at premises of several leaders, including Mirwaiz. The NIA probe seeks to identify the chain of players behind the financing of terrorist activities.