"All regional police chiefs are investigating suspicious activities in their areas," said police spokesman Major General Ariyanto Budiharjo. "The suicide bombers did not work alone. Someone must have ordered them. Someone must have made the explosives."
Investigators across the country were interrogating jailed terror convicts, checking if they recognized the bombers, Bali police said.
Officers have revealed little about the continuing probe, fearing that information released to media could help people linked to the attacks stay one step ahead of them.
Authorities have also questioned Balinese residents who are not native to the island.
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