Says Ajit Doval, former Director, Intelligence Bureau: "The assault from the east and entrenchment in the hinterland are two disturbing trends on the terrorist front. What is lesser known and more serious is HUJI's intimate and old Al-Qaeda linkages. Now that Al Qaeda the world over is in the business of outsourcing terror through franchise, this organisation should figure high on the security radar."

Consider the following revelations Babu Bhai made about his "deliveries" of explosives and training of terrorists:

l 40 kg of RDX in Varanasi in early 2004: He carried this on board Jammu Tawi Express from Howrah to Varanasi and gave it to one "Raju" the next day outside the station. STF verified his claim that he stayed in the name of Amanullah Mandal (name on his fake driving licence) in Hotel Sagar at Gowdhulia chowk.

Investigators now believe that this RDX may have been used in the February 2005 blasts at Dashashwamegha Ghat, which killed nine people.

• 40 kg of RDX in Mumbai in June-July 2004: Babu Bhai claims he delivered this to one "Ravi" outside the Victoria Terminus station. Although Babu Bhai has described "Ravi", he is untraced. Agencies are not clear whether this explosive was used in Mumbai train blasts of 2006.

• 20 kg of explosives in Delhi in August-September 2005, weeks before the Sarojini Nagar blasts: The timing is critical as this was weeks before October 29, 2005 blasts in Delhi. Babu Bhai's report says that 10 days before the beginning of Ramzaan (August-September 2005) he delivered 20 kg of RDX to one "Guru alias Rocky" outside Jama Masjid Gate No 1. He adds he stayed with his friend Qadir in Turkman gate for two days before returning to Kolkata.

... contd.