Last month, summons issued by the special NIA court at Panchkula were handed over to the Pakistani authorities, for sending the 13 witnesses to India for the trial.
Pakistani recently conveyed through diplomatic channels that it needed four more months for taking a decision on producing the witnesses before the Indian court, official sources said.
The court, while issuing the summons on March 17, had asked the witnesses to appear before it from July 4.
Sixty-eight people were charred to death in the blasts in two coaches of the Samjhauta Express in Panipat on February 18, 2007.
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The NIA has filed a charge sheet against several people, including Swami Aseemanand, who walked free in the Ajmer Dargah blast case earlier this year after prosecution witnesses turned hostile.
The case pertains to an alleged criminal conspiracy which resulted in the blasts in Samjhauta Express.
The NIA, in investigations spreading over almost a year, held that the entire conspiracy was hatched between 2005 and 2007 by Aseemanand, Joshi and their associates at different places including Gujarat and Madhya Pradesh.
As a result, Aseemanand propounded a "bomb ka badla bomb" (Bomb for a bomb) theory, according to the NIA charge sheet, which added that they chose the Samjhauta train as most of its passengers are Pakistani citizens.
The Samjhauta Express, also called Attari Express, is a bi-weekly train that runs on Wednesdays and Sundays - between Delhi and Attari in India and Lahore in Pakistan.
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