Sources in NIA said the CD was seized by Delhi Police during searches carried out in a guest house in the old Delhi area from where it has seized arms, ammunitions and other material, claiming that Shah's cronies had brought them.
Police has seized computer hard disks and CDs of the cameras installed in the area.
When NIA took over the case, it sent them for a forensic analysis at the Central Forensic Science Laboratory which said that condition of the disks was so bad that it was difficult to retrieve any data from them.
Following this, NIA got permission of the Special Court to analyse the CD containing footage from the CCTV installed at the Jama Masjid police station from Electronics Corporation of India Ltd which had set the up the monitoring system there, the sources said.
The sources said the analysis of the data is important to substantiate events that took place during and after the arrest of Shah from the Indo-Nepal border, as claimed by Delhi Police.
While Delhi Police had claimed that with Liyaqat's arrest they had foiled a 'fidayeen' (suicide) attack in the national capital ahead of Holi, J&K Police insisted that he was one of those who had exfiltrated in 1990s and returned to India for surrendering under the state's rehabilitation policy.
The special cell of Delhi Police had earlier said that Liyaqat, a J&K resident, was apprehended from the Indo-Nepal border area and had told his interrogators that he is a trained militant of banned terror group Hizbul Mujahideen and was settled in Muzaffarabad in Pakistan-occupied Kashmir (PoK).