-- PHOTO: INDONESIA NATIONAL POLICE
Origins
Has roots in Darul Islam, a radical movement in Indonesia in the 1940s. Founded by JI leaders Abu Bakar Bashir and Abdullah Sungkar in 1993 in Malaysia.
Key leaders
Abu Bakar Bashir: Released from prison, lives in Indonesia as a preacher.
Abu Jibril: Released from prison, resides in Indonesia as a preacher.
Riduan Isamuddin or Hambali: In US custody.
Noordin Mat Top: On the run.
Mas Selamat Kastari: On the run.
BALI BLASTS: People running away after the bomb explosions on Oct 12, 2002 -- PHOTO: INDONESIA NATIONAL POLICE
Bomb attacks
2002, Bali: More than 200 people killed.
2003, JW Marriott Hotel, Jakarta: Twelve killed, 150 injured.
2004, Australian Embassy, Jakarta: Nine killed, 150 injured.
2005, Bali: Twenty killed, 129 injured.
S'pore-Jakarta links
Abu Bakar Bashir, JI's spiritual leader, preached in Malaysia and Singapore after fleeing Indonesia in 1985.
Mas Selamat Kastari, the leader of Singapore's JI chapter, was arrested in Indonesia and later deported to Singapore in 2006.
He escaped from the Whitley Road Detention Centre in February.
His son is believed to be studying at a religious school in Java.