As news about the summons spread, lawyers across the Valley suspended work and decided to stay away from the courts tomorrow as well.
The Bar Association said in a statement that the NIA notice was "dastardly persecution" of innocent people, who continue to be victims of the "NIA onslaught".
Qayoom, considered close to pro-Pakistan separatist leader Syed Ali Shah Geelani who heads the anti-national conglomerate Tehreek-e-Hurriyat, has been asked to appear before the agency on Wednesday, officials said.
Qayoom is likely to face questions about properties that have allegedly been procured by him, NIA officials said.
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On May 30, NIA registered the case and named Hafiz Saeed, leader of the Pakistan-based Jamaat-ud-Dawa and banned terrorist outfit Lashkar-e-Taiba, as an accused.
It also accused separatist and secessionist leaders of being in cahoots with terrorist groups.
The case was registered on issues of raising, receiving and collecting funds through various illegal means, including through hawala channels, for funding separatist and terrorist activities in the state.
It was the first time since the rise of militancy in the early 1990s that a central probe agency conducted raids in connection with the funding of terrorist and separatist groups.
The Bar Association said in its statement that lawyers across the Valley had immediately suspended work and boycotted the courts.
A general body meeting would be held in the High Court tomorrow to discuss the NIA summons and the chalk out future course of action, it added.
It also also linked the summons with an ongoing petition in the Supreme Court challenging Article 35-A, which gives special rights to the residents of Jammu and Kashmir.
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