7/11 Mumbai serial blasts was a tough nut to crack reason being unseen faces and a mastermind who triggered it from Pakistan and this made the job of the investigators difficult.
In the beginning probe agency was shooting in the dark to pinpoint this ghastly act until one lead that came by was when two persons were distributing sweets following the blast.
The accused persons were brought down to Bengaluru’s Forensic Science Laboratory where they were subjected to various scientific tests. Conducting the tests on them was extremely difficult as two of the accused were masters at dodging investigation. Two accused had even trained to beat a polygraph test when they were training in Pakistan.
The accused were professionals at dodging all questions posed to them and as such the same questions had to be asked in different ways before more leads came out of the case. During the tests, the accused spoke about how some of them had gone to Pakistan for training. They also revealed the source of explosives and the way it was prepared.
They also spoke about how some of them had conducted a reconnaissance of the trains that were bombed on that unfortunate day.