The IB, also represented by advocate C K Bhatt, has further said that the case was investigated by the Anti-Terrorist Squad (ATS) of Maharashtra Police.
On July 11, 2006, seven RDX explosions ripped through as many Western line local trains in Mumbai, leading to the death of 189 people and injuring 829.
While the Uttar Pradesh police shot dead suspected terrorist Mohammad Saifullah yesterday, six suspects have been arrested by cops in Madhya Pradesh and UP on terror charges, Singh said.
The terror suspect Saifullah was killed in an exchange of fire with the police.
Choice of location and type of IED used suggests that either a module of Al Qaeda in Indian Subcontinent (AQIS) or the SIMI could have hit the Bhopal-Ujjain Passenger train.
NIA officials will interact with Madhya Pradesh police personnel and verify leads available with them.
The terrorists, who hailed from Kanpur and Kannauj had made plans to rush back to Lucknow once their nefarious plans to set off the bomb had come through.
The anti-terror operation ended after nearly 12 hours.