The Delhi Police’s chargesheet on the September 13 serial blasts in the Capital hinges heavily on mobile intercepts of the accused to ascertain the concrete links of the conspiracy.

The chargesheet says slain Indian Mujahideen suspect Atif Amin was the operational head of the serial blasts. It also says Atif was involved in setting off bombs in Uttar Pradesh in 2006 and in Jaipur and Ahmedabad this year.

The chargesheet says three numbers — 9712398204, 9714552899 and 9724764196 — had been under surveillance of the Special Cell since August this year. This was part of the probe into the Ahmedabad blasts.

Atif’s group allegedly used two numbers — 9712398204 and 9714552899. Wiretaps have shown they were working in Delhi’s Jamia Nagar between July 17 and 22. But it sent out signals from Ahmedabad on July 23. The third number was used by co-accused Qayamuddin, who allegedly assisted Atif in carrying out blasts in Ahmedabad and Delhi.

On July 26, the day bombs went off in Ahmedabad killing five, all three numbers were switched off.

During his stay in Gujarat, these numbers were also found to be in touch with a BSNL connection in Uttar Pradesh (East) — 9415835341. This, the police said, was used by Dr Shahnawaz, a resident of Azamgarh and a co-conspirator.

Another number (9811004309) also surfaced in the Special Cell’s radar in later days. It had a post-paid connection and was registered in Atif’s name.

The chargesheet also says that there were no calls to this on November 23, 2007, the day bombs went off in UP courts. It was also off during the times explosions occurred in Jaipur on May 13, in Ahmedabad on July 26 and in Delhi on September 13.

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