Two terror suspects arrested and later released by the Densus 88 Counterterrorism Unit last month are known to be members of Muhammadiyah, the second largest Muslim organization in the country.

"They are Mugi Haryanto and Supari. Both are chairman and deputy chairman of the Muhammadiyah branch in a village in Tulungagung [in East Java]," Muhammadiyah chairman Din Syamsuddin said as quoted by tempo.co on Monday.

Din said that the antiterror squad had made a wrongful arrest, claiming that neither Mugi nor Supari had ties with the two terror suspects shot by Densus, Rizal alias Eko and M. Hidayah, or any terror groups.

Rizal reportedly came to Mugi's village to propagate Islam and teach Koranic recital. He lived in a kindergarten managed by Aisyiyah, Muhammadiyah's women organization. Din said that Rizal was welcome and well liked by the villagers.

After three months staying in the village, Hidayah came to visit Rizal and asked Mugi and Supari to take them to the city to get a bus. Densus members raided them when they were standing at a bus stop. Rizal and Hidayah were killed in the raid, while Mugi and Supari were arrested.

The National Commission on Human Rights (Komnas HAM) said that based on its investigation the killing of the terror suspects in Tulungagung was a violation of human rights. "They have not yet been proven guilty yet," Komnas HAM member Siane Indriani said as quoted by Antara.

Komnas HAM's investigation found that the terror suspects did not resist arrest and were only carrying boxes containing instant noodles and books when they were attacked by plainclothes Densus members.

Human rights activists deplored the arrest of Mugi and Supari, who were detained for a week without any clear charges.