A bomb rocked Indonesia's Parliament building yesterday, shattering glass and damaging a wall, just days after police arrested nine Islamic militants they said were planning fresh terror attacks.

　　No one was injured in the blast, the latest in a series of small bombings in the world's most populous Muslim nation since last year's devastating attacks on Bali island.

　　Police said Jemaah Islamiyah, the regional terror group blamed for the October 12 Bali bombings that killed 202 people, was one of two prime suspects in the attack. The other is the rebel group fighting for an independent state in the western province of Aceh.

　　The early morning explosion damaged a wall of a building at the complex in central Jakarta and smashed several windows, witnesses said.

　　Jakarta Police Chief Major General Makbul Padmanegara said officers were investigating the type of explosive used in the blast.

　　"We know it caused quite a big explosion and was quite dangerous," he said. The blast was heard several kilometers away.

　　"There was a massive boom," said Karno, a security guard who goes by a single name. "I panicked but soon got my friends to check it out with me."

　　There were no legislators at Parliament, which was on its summer break. Security at the sprawling complex is tight, and police have recently started searching vehicles for explosives as they enter.

　　Last Friday, anti-terrorist police confiscated a huge haul of explosives, detonators and weapons from a bomb-making factory in the central Javanese town of Semarang.

　　Officers also announced the arrest of nine suspected members of Jemaah Islamiyah they said were planning more terror attacks.

　　Since the Bali blasts, most Western governments have warned their citizens to avoid travel to Indonesia, saying that more bombings were possible.