Tunda joined jehadi forces in 1985 after some of his relatives were killed in communal riots in Bhiwandi, Maharashtra.
“He wanted to strike back. That was the time when he actually remembered the old trick and started experimenting with sugar, potash and sulphuric acid and learnt to make a bomb,” said the officer.
Later, in Mumbai, he befriended one Jalees Ansari, whom he taught the tricks of bomb-making. Ansari went on to earn the dubious distinction of being ‘Dr Bomb’.