Indonesian police have arrested four people in connection with a bombing at Australia's embassy in Jakarta that killed 11 including the suicide bomber.
The arrests could lead police to the attack's masterminds
The suspects include a planner and a bomb-maker, police said.
Three of the men were arrested on 5 November and were on a wanted list, with rewards of 500 million rupiah (US $55,000) offered for each.
The September attack has been blamed on Islamic militant group Jemaah Islamiah, which has been linked to al-Qaeda.
The BBC's correspondent in Jakarta, Rachel Harvey, says these arrests mark a major breakthrough in the investigation into the Australian embassy bombing.
The four men were named as Sogir (alias Ansori), Rois (also known as Iwan Darmwan), Hasan and Apuy.
National police chief D'ai Bachtiar said Sogir had played a bomb-making role, and Rois had been responsible for recruiting Heri Golun, the suicide bomber who died in the blast.
The bomb attack was blamed on the Jemaah Islamiah group
They were captured in the West Javan town of Bogor, about 60km from the Indonesian capital, by a special team of American-trained anti-terror police.
According to the police, the suspects were all wearing small bags tied around their waists, containing home-made bombs designed to be detonated in the event of imminent capture. But for some reason the individual's suicide packs were not used.
Masterminds still at large
Police officers said the arrests were not immediately announced for fear of compromising the hunt for other militants still on the run.
The authorities are still hunting two Malaysian militants, Azahari Husin and Noordin Mohamed Top, whom they suspect masterminded the attack, and to have been involved in other bombings linked to Jemaah Islamiah, including the 2002 attack on the nightclubs in Bali.
Police hope the latest men to be arrested will help them in their search.
Australian Foreign Minister Alexander Downer congratulated police on the arrests.
"We welcome the work that the Indonesian National Police are doing now in following up the various leads that have become available," he told reporters.
"They have been vigorous in tracking down and trying to bring to justice those responsible," he said.