Indonesian police detectives admitted that they had not made any significant progress in the investigation and were still busy collecting clues and evidence at the blast sites, the Jakarta Post reported on Sunday, Xinhua reported.
"All I know is that right now we're a bit stuck in our investigation. I hope this is not for long," said an unnamed field officer.
Indonesian President Susilo Bambang Yudhoyono was scheduled to brief the press on Saturday upon visiting the JW Marriott hotel and the Ritz Carlton hotel that were damaged by Friday's bombings, but left without speaking publicly.
"There are indications that the explosive used in Friday's bombings are similar to those found in Cilacap and those used in the Bali Bombings," said the National Police spokesman Nanan Sukarna, indicating that the attacks were perpetrated by the Jamaah Islamiyah terror network.
"But, that's what we found in the field. We are still trying to piece together the whole puzzle," Nanan said.
Earlier this month, Indonesia's counter-terrorist squad Densus 88 uncovered bomb-making materials in the backyard of a house belonging to fugitive terror suspect Bahrudin in Cilacap, Central Java. A witness said that the materials include sulfur powder, wires wrapped in plastic and a number of books and VCDs about jihad.
Rumors are also circulating that the 1.5 million U.S. dollars robbery of an armored van on a Jakarta toll road last week was also done by terrorists, who were seeking money for the families of the two suicide bombers.
Jakarta police spokesman Chrysnanda confirmed several suspects have been arrested in connection with the robbery but did not confirm the relation between this case and the two blasts.
Meanwhile, Jakarta Governo Fauzi Bowo said he had instructed all of Jakarta's majors, district and sub-district heads, as well as communication unit and neighborhood unit chiefs to remain alert in order to detect the possible terrorist safe houses.
The perpetrators of the 2003 JW Marriott Bombing moved form one rented house to another to avoid police detection as they planned and prepared for their attacks.