JAKARTA, June 14 (Xinhua) -- A key member of radical group the Islam Defenders Front (FPI) has been arrested in Indonesia for his alleged role in the June 1 attack on peace rally for religious freedom, local press said Saturday.

    Matsuni, 40, allegedly leads the combative division of the FPI, was arrested in Cirebon, West Java, on Friday.

    "He was at the scene when the attack happened. We are still questioning him," Jakarta Police spokesman Sr. Comr. Ketut Untung Yoga Ana was quoted by major newspaper The Jakarta Post as saying.

    Ketut said Matsuni was one of 20 suspects identified by police involved in attacks on dozens of activists from the National Alliance for the Freedom of Faith and Religion (AKKBB).

    They went to the National Monument Park (Monas) here to commemorate the state ideology of Pancasila and show their support to the Ahmadiyah sect, whose beliefs have sparked recent controversy. The attack left at least 70 people injured.

    Eight other suspects, including the leader of the Islam Troop Command, Munarman, are officially under police custody, leaving the remaining 11 at large.

    The police also detained FPI leader Rizieq Shihab two days after the attack, accusing him of provocation and protecting criminals.