Who is Terrorist Saqib Nachan and what`s his connection with Zakir Nayak?

As per latest reports, NIA took major action during the raid on ISIS. Maharashtra module leader Saquib Nachan has been arrested. It is being told that Nachan was sentenced to 10 years in Mumbai blasts. It is being said that a conspiracy was being hatched to terrorize the country with drones. Now the question arises that who is this Saqib Nachan and what is his relation with Zakir Nayak?