A secret unit in Pakistan's Inter-Services Intelligence (ISI) has played a key role in executing terror attacks in India over the years. The unit is known as S1 or Subversion 1, NDTV reported citing sources, who described it as the biggest driver behind the forces of cross-border terrorism. It is headed by a Colonel of the Pakistani Army, while two ranking officers look after active operations. The two officers are codenamed Gazi 1 and Gazi 2.

S1 is headquartered in Pakistani capital Islamabad, and a majority of its terror activities are funded by drug money, the report said. The unit's personnel and trainers are experts in making all types of bombs and improvised explosive devices (IEDs). They can also handle a wide range of small arms. S1 is believed to have detailed maps of most places

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