The mastermind behind Rameshwaram Cafe blast in Bengaluru, Abdul Matheen Taha is said to one of the Islamic State terrorist group's "high value assets" in India. On Friday, Taha and his aide Mussavir Hussain Shazib, who placed the bomb at the cafe on March 1, were arrested by the National Investigation Agency (NIA) from their hideout near Kolkata.