Santoso was born 21 August 1976 in
Tentena,
Central Sulawesi, Indonesia. Tentena is about 7 hours by bus from the capital of
Central Sulawesi,
Palu. This small town of mostly Christians lies on the northern shores of
Lake Poso. Tentena has a history of past conflicts with the surrounding Islamic villages.
Poso conflict He participated in military training in 2001. He was involved in
jihad during inter-religious conflict between
Christians and
Muslims in
Poso from 1998 to 2001. It is known that he was inspired by the preaching of
Abu Bakar Ba'asyir,
Abdullah Sungkar,
Imam Samudra,
Azahari Husin and
Noordin Mohammad Top. Some reports say he studied Islam at
Al-Mukmin Islamic school in
Ngruki district,
Surakarta,
Central Java. According to an interview with
Andi Baso Tahir, an old friend of Santoso in
Tokorondo village, in 2006 Santoso was arrested for robbing a
boxcar in a coastal town of
Poso. He was jailed for a year. According to the friend, after he left prison, Santoso stopped militancy for a period and "became a peddler, selling cleavers, cooking utensils and clothes". The same friend places him in Masani village, a coastal town of
Poso, in 2012, where Santoso supposedly suddenly turned up during a daurah [koran reading]. ==Mujahidin Indonesia Timur==