Singh stated this in response to former Jammu and Kashmir chief minister Farooq Abdullah's comments on the arrest of separatist leaders by the National Investigation Agency (NIA) which is investigating terror funding in the valley.
Abdullah had said yesterday that he would accept the NIA raids on separatists as "genuine" only if the probe finds something against them.
"NIA is a professional unit, which runs on certain rules," Minister of State in the PMO Singh said.