Sadiq is the mastermind of 7/11 serial train blasts in Mumbai. He was also assigned the responsibility of recruiting members to Indian Mujahideen. It is also learnt that Sadiq assisted Atif Sheikh, one more IM operative of the Delhi serial blasts to reach Pakistan for training.
In his confessions, Sadiq said that: “All five of us arranged local train passes for the first class compartments before hand. We also had local train time table with us so that we could find out the train as per our convenience. We purchased bags and pressure cookers in Mumbai. On the day of blast that is on 11 July, 2006, all five of us assembled and we filled seven cookers with explosives. We kept the bombs ready. We had planned the bomb to blast at 6:30 pm," said Sadiq in the confession recorded.
Sadiq Sheikh is in the custody of the Maharashtra Anti-Terrorism Squad (ATS) for his connection with the July 2006 serial train blasts in Mumbai.