Terror leaders in Indonesia get prison terms

The two judges also labeled Jemaah Islamiyah a terrorist group, a move that could pave the way for the government to ban the group, something it has previously said would be difficult because it was not a "formal organization."

Even without a ban on the network, the government's crackdown has met with huge success, resulting in hundreds of arrests in recent years, thanks partly to forensic and technical help from foreign governments.

Jemaah Islamiyah was formed in the early 1990s as an offshoot of another militant network stretching back decades. Its core leadership fought or trained in Afghanistan and some came under the influence of al-Qaida.

A regional crackdown following the Bali attacks netted hundreds of members and sympathizers, severely weakening the group. Former members and analysts say a hard-core faction that carried out the bombings no longer operates under Jemaah Islamiyah's command.