The chargesheet on the terror attack in Mumbai [Images], which was filed by the Mumbai police on Wednesday evening, has clearly pinpointed the role of Pakistan-based elements in perpetrating the attack.

The chargesheet states that one Colonel R Saadat Ullah had purchased the Voice over Internet Protocol Account, which was later used by the terrorists during the three-day terror siege in November last year.

Investigations have revealed that Colonel Saadat Ullah is part of the Special Communication Organisation in Pakistan.

According to various websites on the Pakistan army [Images], the SCO is a government organisation that operates under the aegis of the Ministry of Information and Technology. It was established in 1976.

The SCO is the largest telecommunication network provider in Pakistan-occupied-Kashmir. It also provides internet, PSTN, GSM and CDMA services.

But the main function of SCO is to facilitate communication between Pakistan army personnel and their counterparts in PoK, Intelligence Bureau sources told rediff.com.

Though the SCO is officially under the purview of the Ministry for Information in Pakistan, the organisation works on the orders of the Pakistan army, say sources. The SCO is made up of serving as well as retired army officials who have specialised in telecommunications.

The SCO, which is located at Qasim Road in Rawalpindi, is listed as a special unit by the Pakistan army. All tenders issued by the SCO are always signed by a colonel, indicating its connections with the Pakistan army.