Blast accused Dhan Singh, who was arrested by the National Investigation Agency (NIA) along with three others, moved the Special MCOCA court saying that ATS had filed a chargesheet and the case was taken over by the CBI in 2007 which also filed a supplementary chargesheet.
"Whatever has been done by NIA, under the guise of further investigation is totally bad in law and hence the material collected by NIA has no legal sanctity," the application said.
Dhan Singh has sought that the investigation carried out by NIA be declared illegal. He has also prayed that if the court feels it proper, then his application may be sent to the Bombay High court for reference.
The NIA is likely to file its reply on the application on July 22.
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He has also moved another application in the court saying that he may be allowed to file a say in the discharge application filed by two accused - Mohammad Ali Alam Sheikh and Asif Khan Bashir Khan. Sheikh and Khan had filed a discharge application last week.
"The matter without any sufficient cause was transferred to NIA for the purpose of political gains at the instigation of political parties and a deliberate attempt has been made to deviate the direction of the investigation," read his application.