Police announced the arrests Saturday of four suspects in a Sept. 9 suicide bombing at the Australian Embassy, the first breakthrough in the case.

The four men were detained under anti-terrorist laws but have not been charged in the attack, which killed nine people and wounded nearly 180.

Police chief Gen. Dai Bachtiar said he was "convinced" police would capture the alleged masterminds, Malaysian militants Azahari bin Husin (search) and Noordin Mohamed Top (search).

"The more arrests we make, the more information we get," Bachtiar said.

Police were questioning nine other people, among dozens detained in connection with the attack. Most have been released.

The arrests Saturday were the first in the case.

The bombing has been blamed on Jemaah Islamiyah (search), a militant network affiliated with Al Qaeda that was also implicated in the 2002 Bali bombings (search) and an attack last year on the J.W. Marriott Hotel in Jakarta.

One of the four suspects, identified by his initials A.A.H., has confessed to transporting explosives used in the embassy blast to Jakarta from a safe house in western Java, Bachtiar said.

He was picked up after the bombing, Bachtiar said.

The other three were detained before the attack happened, but police have since determined that they were linked to it, he said.

In a related development on Saturday, the jailed cleric accused of heading Jemaah Islamiyah condemned the embassy attack, and reiterated that he had nothing to do with it.

"I personally condemn the bombing (and) I am deeply sorry and express my condolences to the victims," Abu Bakar Bashir said, according to his lawyer Wirawan Adnan, who visited the cleric in his cell in Cipinang Prison.

Abu Bakar Bashir has been in jail since 2002, when he was convicted for minor immigration infractions. Prosecutors say they now plan to charge him with heading Jemaah Islamiyah, and for the Marriott bombing last year that killed 12.

Bashir has denied any involvement in terrorism and claims that Jakarta buckled under pressure from Washington to arrest him as part of a crackdown on Islamic activists in the world's most populous Muslim nation.

"I deny all accusations that connect the bombing with me," Bashir said. "Terrorists must be punished and eliminated for good."