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Jamaah Ansharut Tauhid, Jemaah Anshorut Tauhid, or (JAT) is a splinter cell of the Jemaah Islamiyah (JI) designated as a terrorist organization by the United Nations and the United States. The latter is most known for perpetrating the 2002 Bali bombings.[1]


Jamaah Ansharut Tauhid was formed by Abu Bakar Baasyir on 27 July 2008 in Solo, Java, Indonesia[2] and has bases across Indonesia including in Aceh and Central Sulawesi.[3]

In September 2011, a JAT suicide bomber detonated explosives in a central Java church, killing himself and wounding dozens of others.[4]

On March 18, 2012, at least one of five armed men killed by Indonesian counter-terrorist forces in Bali was said to be a member of JAT.[5] The men were killed while awaiting the arrival of prostitutes at a local hotel.[6]

In 2012, the U.S. Department of State and the United Nations placed sanctions on the organization and named it as a terrorist group.[4][7][8]

In 2012, the group was thought to have approximately 1,500–2,000 members.[3]

The group remained very active in Indonesia in 2012, and it publicly maintained a website, as of January 2013.[9] Abu Bakar Baasyir's son, Abdul Rohim Ba'asyir was said to be JAT's PR Chairman and had worked for al-Qaeda in Afghanistan in 2002.[3]

In August 2014, the group suffered a split over Abu Bakar Baasyir's pledge of allegiance to Abu Bakr al-Baghdadi, leader of the Islamic State of Iraq and the Levant (ISIS).[3][10] Many members of the group, including top leaders, and Baasyir's sons reportedly disagreed with this decision over ideological reasons and left to form a new group called Jamaah Ansharusy Syariah,[11] led by Mochammad Achwan.


  1. ^ Foreign Terrorist Organizations, Bureau of Counterterrorism, September 28, 2012
  2. ^ Janes, Jamaah Ansharut Tauhid (JAT) (Indonesia), GROUPS - ASIA - ACTIVE,
  3. ^ a b c d Jamaah Ansharut Tauhid, The Perpetual threat, Chris Rottenberg, Osgood Center for International Studies, 2012,
  4. ^ a b CNN, Indonesian group added to U.S. terror list, By Jamie Crawford,
  5. ^ Bali shoot-outs nab wanted terror suspect, March 19, 2012, Karlis Salna, AAP South-East Asia Correspondent,
  6. ^ ASIA:Dead Bali robbers waiting for prostitutes, By Karlis Salna, AAP South-East Asia Correspondent,
  7. ^ UN, Security Council Al-Qaida Sanctions Committee Adds, Two Individuals and One Entity to Sanctions List, 12 March 2012,
  8. ^ U.S. Dept of State, Terrorist Designations of Jemmah Anshorut Tauhid, February 23, 2012,
  9. ^ Jamaah Ansharut Tauhid website, accessed 17 January 2013,
  10. ^ "ISIS Now Has Military Allies in 11 Countries -- NYMag". Daily Intelligencer. Retrieved 25 November 2014.
  11. ^ "Sons, top aides abandon Ba'asyir over ISIL, form new jihadist group". The Jakarta Post. 13 August 2014.