All the three terror suspects arrested in the crackdown on the ISIS network in Delhi and Uttar Pradesh today are engineers by education and had expertise in making bombs, police have said. HGS Dhaliwal, senior officer in Delhi Police Special Cell, said one of the three terror suspects arrested today is Mohammad Shahnawaz, who was on the most wanted list of National Investigation Agency (NIA). The NIA had last month announced a cash award of Rs. 3 lakh each for information about Shahnawaz and two others, who allegedly played key roles in blasts in different parts of the country.