Omer Farooq, who was arrested from Rajasthan, is a prize catch for the police, as he was the one who had supplied the explosives that were used to carry out the blasts.
Three city-based youths, who were arrested last month for allegedly planning to join jihadi terror groups such as ISIS, were taken into police custody on Tuesday.
Police in Jammu and Kashmir and Telangana are investigating claims by three arrested youths from Hyderabad that they were planning to meet separatist leader Asiya Andrabi to join jihadi terror groups even as she dismissed as "fabricated" allegations that she had any links with Islamic State.