The report from the Institute for Policy Analysis of Conflict (IPAC), confirmed the authenticity of a June 30 video statement by 16 Jemaah Islamiah (JI) leaders announcing they were dissolving the extremist network.
In the statement, captured on video and shared online, the leaders confirmed their commitment to the Indonesian state and law, and said all material taught in JI-affiliated boarding schools would be in line with orthodox Islam.
"It is too early to say what the consequences are, but the men who signed the statement have enough respect and credibility within the organisation to ensure widespread acceptance," said Sidney Jones, who authored IPAC's preliminary analysis.
The al-Qaeda linked militant group is accused of orchestrating some of the deadliest attacks in Indonesia, including the 2002 bombing of Bali nightclubs that killed more than 200 people, including 88 Australians.
Indonesia's National Counter Terrorism Agency declined to comment on the development, but said it planned to soon hold a media conference.
The decision to disband the organisation, said Jones, was likely driven by several factors, including the influence of intellectuals within JI who were less interested in violent jihad, and a cost-benefit analysis on the best way to protect the group's biggest assets - its schools.
Intensive engagement with counter-terrorism officials also played a role, the report said.
Despite the clout of the figures involved, IPAC noted the group has a history of splinters and it was possible one could emerge in the future, although probably not immediately.
"For the moment, the likely result is the flourishing of JI-affiliated schools and the increasing involvement in public life of the men who signed the 30 June statement," IPAC said.
"What happens to the rest of the membership remains to be seen."
