SYDNEY, 15 November 2005 — Militants arrested last week on charges of plotting a major terrorist bombing were caught by police near Australia’s only nuclear reactor last year and underwent “jihad training” at outback camps west of Sydney, police alleged in documents released yesterday.

A police fact-sheet submitted in court here also alleged that the leader of the 18 Muslims arrested in Sydney and Melbourne urged his followers to unleash “maximum damage” as part of a holy war. The 20-page document, tendered in court on Friday but not released to the public until yesterday, said three of the 18 had been stopped by police acting suspiciously near the Lucas Heights research reactor in suburban Sydney.

The men said they were in the area to ride a trail bike that was in the back of their car, but when questioned separately gave differing accounts of their activities, police said. Police later found that a lock on a gate to a reservoir on the grounds of the facility had recently been cut, the document said.

The government’s Australian Nuclear Science and Technology Organization (ANSTO), which operates the Sydney reactor, played down any threat. ANSTO issued a statement saying the area where the men’s car was noticed “is regularly used by the public for trail bike riding and bushwalking” and that security agencies at the time did not see the trio as a threat. It also said the fencing that had been cut near the reservoir was hundreds of meters from the reactor and not part of the ANSTO facility.

Police and security agents detained the 18 before dawn on Nov. 8 in the country’s biggest counterterrorism operation.

All were Australian-born or naturalized citizens. Officials accused them of plotting a “catastrophic” act of terrorism, although no precise targets were alleged.

The arrests heightened security fears across Australia and sparked an extraordinary terrorism alert yesterday in the third largest city, Brisbane. Authorities in the east coast city announced in mid-afternoon that all public buses and trains would unload their passengers for 30 minutes during the evening rush hour due to three anonymous telephone threats.

Local officials said they ordered the “overly cautious” reaction due to heightened security concerns following the arrests in Sydney and Melbourne. The 30-minute transport shutdown went off without incident and the threats appeared to have been a hoax.

The 18 detained suspects have been charged with membership in a terrorist organization and or stockpiling explosives components in preparation for a terrorist act.

In the list of allegations released yesterday, police said they were linked to an extremist group led by a Melbourne Muslim cleric, Abdul Nacer Benbrika, also known as Abu Bakr, who was among those detained.

“Benbrika is an extremist and has publicly declared his support for a violent jihad,” it said, adding that the cleric had “a core group of followers in Melbourne who are associated with the persons of interest in Sydney.”

Police quoted Benbrika as telling some of the suspects during a meeting in February that if they wanted to “die for jihad, we have to have maximum damage”.

“Damage their buildings, everything. Damage their lives to show them,” he allegedly said, in statements obtained through electronic eavesdropping. “In this we’ll have to be careful.”

Six of the Sydney suspects allegedly underwent military-style training early this year at two properties near Bourke in the far west of New South Wales state, the report said.