The sketches were released at a joint news conference by Indonesian and Australian investigators
Lead Indonesian investigator I Made Mangku Pastika displays pictures of Amrozi's step brother Sumarno
|BALI, Indonesia (CNN) -- Police investigating the deadly bombings on the Indonesian island of Bali have released new sketches of six suspects, including one they say was the chief planner behind the attack.|
|The man, Imam Samudra, decided where the bombs should be placed
and in what order they should go off in order to maximize casualties, investigators
According to intelligence sources he is also a member of the Jemaah Islamiyah (JI), an Islamic militant group linked to al Qaeda and believed to have been behind the attack.
A picture of Imam Samudra was among sketches and photographs of six suspects investigators say they want to question.
At least 180 people died in the October 12 bombings in the popular Bali resort town of Kuta. The majority of the dead and injured were young Australian tourists.
A seventh suspect, named only as Amrozi, is already in custody in connection with the blasts.
Revealing the new sketches, I Made Mangku Pastika, the Indonesian chief investigator, and Graham Ashton, the lead Australian investigator, said at a news conference that the six suspects are believed to be still in Indonesia.
They believe two of the suspects, named as Idris, and Dul Matin, cooperated with Iman Samudra in the construction of the bomb.
Dul Matin is believed to be an electronics expert in mobile phones, which were used to trigger the blast.
"He is a second-hand car dealer, an electronics expert and his role was to detonate the bombs by cellular phone," Pastika said.
He added that investigators believed Imam Samudra had learned bomb-making skills "during visits in Afghanistan," although he did not give further details or say on what evidence that belief was based.
Last week, police identified Amrozi as the owner of a van used in the attack.
In an unusual public display, Amrozi was questioned publicly by the police chief in Bali in front of several members of the media.
During the interrogation, Amrozi smiled at the media throng and said he was glad the bombs went off as planned.
On Tuesday, Amrozi's brothers, Ali Imron and Ali Fauzi, were also put forward as suspects.
Police said they are believed to have helped Amrozi plant the bombs and prime them for detonation.
Police are investigating a third brother of Amrozi, named Muchlas, thought to be a senior leader of JI.
According to intelligence documents obtained by CNN, Faiz abu Bakar Bafana, a JI suspect currently in custody in Singapore, admitted meeting Muchlas.
In a confession attributed to him, Bafana said Muchlas would take over the responsibilities of Hambali, a leading terrorist suspect in Southeast Asia, as the regional leader of JI.
All the men involved have ties to Abu Bakar Ba'asyir, the alleged spiritual leader of JI.
Ba'asyir is currently being held by Indonesian police, but has so far refused to answer any questions related to terrorism.
-- CNN Correspondent Atika Shubert contributed to this report