"Jemaah Islamiyah (JI) is an Indonesia-based clandestine terrorist network formed in the early 1990s to establish an Islamic state encompassing southern Thailand, Malaysia, Singapore, Indonesia, Brunei, and the southern Philippines. Its operatives, who trained in camps in Afghanistan and the southern Philippines, began conducting attacks in 1999. The network's existence was discovered in late 2001 after Singaporean authorities disrupted a cell that was planning to attack targets associated with the US Navy. JI is responsible for a series of lethal bombings targeting Western interests in Indonesia and the Philippines from 2000-2005 […] Southeast Asian governments since 2002 have arrested more than 300 suspected terrorists, significantly degrading JI's network. Thai authorities detained the network's operations chief in 2003. Indonesian police killed JI's most experienced bombmaker in 2005 and arrested its two senior leaders in mid-2007."
National Counterterrorism Center: https://www.dni.gov/nctc