The serial blasts in the national capital on the eve of Diwali, that claimed over 60 lives, was the first of the unsolved cases with central security agencies.

Claims by Delhi Police about some arrests in this case had come under cloud as Tariq Dar arrested in connection with the case accused the police of framing him.

This explosion was followed by blasts outside Sankat Mochan Temple in Varanasi in March 2006 followed by the 11/7 serial train blasts in Mumbai that left nearly 200 people dead.

The Anti-terrorist Squad picked up nearly a dozen people from various states in this connection but neither the actual perpetrators nor conspirators could be brought before the law.

The year 2006 wound up with another blast at Malegaon in Maharashtra that left 30 people dead. The police rounded up some locals and filed a chargesheet but the same was put on hold after locals demanded a fresh investigations by the CBI.

CBI was also probing the twin blast case in Hyderabad that took place in August last year but did not make any headway.

“The matter is being probed,” a CBI spokesman said in reply to a question about the progress in investigation.