The NIA has sought seven-day custody of the accused as part of the probe. Considering the plea, the court issued a warrant for producing Azarudeen before it on Monday.
The five suspects were arrested from the north central region of Horowpothana on the day when eight Tamil National Alliance members voted against the Emergency declared in the country.
This was the first incident of violence between the two communities since the April 21 terror attacks.
The move comes as part of the heightened security measures in the wake of the Easter Sunday bombings.
President Maithripala Sirisena has instructed the Telecommunications Regulatory Commission to lift the ban on Facebook, WhatsApp, YouTube and other popular platforms from April 30.
The alleged Sri Lanka blasts plotter Zahran Hashim may also be associated with a Tamil Nadu-based Islamic State sympathizers through illegal trade and social media sites.
It has been alerted that female bombers posing as devotees may attack Buddhist temples after authorities seized white clothes from a house that was raided.
Abhinav Chari and his wife, Navroop were in the island nation for a business trip and were staying at the Cinnamon Grand where a bomb had gone off on Easter Sunday.
Abu Hammad, Abu Sufyan and Abu al-Qa'qa had blown themselves up during a crackdown by Special Task Force and Army troops to avoid surrender.
The Sri Lanka massacre proves without doubt that the civilised world and Islam are at war.
Radical and violent Islamic fundamentalism has made landfall in Sri Lanka. Targeted by the Pakistan-controlled terror axis, the island nation faces upheaval that will pit community against community.
Cries of anguish filled the air as ambulances, with their sirens blaring carrying the injured and the dead, were rushing towards the hospital.
Citing a police spokesman, The New 1st outlet reported that the apprehensions took place as part of a nation-wide security operation.
A number of incidents of public disturbance were reported from several parts of the country due to the circulation of false information.
42-year-old Juno Srivastava was last seen having breakfast along with his colleagues before a blast ripped through the Cinnamon Grand Hotel on April 11.