JAKARTA, Oct. 10 (Xinhuanet) -- The investigation into the Oct. 1 Bali bombings has not made any major breakthrough although at least 169 witnesses have been questioned so far, Security Minister Widodo Adi Sucipto said Monday.

    "Nobody has been arrested in connection with the attacks," he told reporters on the sidelines of a cabinet meeting at the state palace here.

    But security officers will do their utmost to uncover the case and bring all the perpetrators to justice, he said.

    At least 23 people were killed and more than 120 others wounded by the explosions allegedly carried out by suicide bombers at three tourist restaurants and bars in Jimbaran and Kuta, Bali.

    It took the police less than three weeks to arrest a key suspect in the nightclub bombings on the resort island three years ago, when 202 people were killed, and the arrest proved to be crucial for the successful investigation.

    More than 30 people were found guilty, three got death penalty for the Oct. 12, 2002 bombings. Enditem