A library photo of Australian Muslims protesting the US-led Iraq war.

The conservative premier also tended this time not to underestimate Muslim efforts in fighting terror, but called on the minority to help police uncover extremist cells promoting hatred, reported Agence France-Presse (AFP).

He said that he would be asking Muslim leaders to help "bust open" radical cells as part of their assistance in the fight against terror.

"They do have responsibilities and we have to guard against this country going down the path of other societies where you have closed cells, where you have people who are the product of being able to operate with a degree of immunity within their own communities, and that really is something that we have to bust open," he said.

But he said that he felt some members of Britain's Muslim community were aware of the planning of the terror attacks which took place in London's transport system on July 7 and killed 56 people, including four British-born Muslim bombers.

"What happened in Britain was that you had British-born people (involved in the attacks)," he said.

"Their communities must have known something of it. I find it hard to accept that they didn't and the reality is that there was no human intelligence suggesting otherwise."

A mosque in south London revealed Saturday that it wrote to police two years ago to express concern about a man who now is a key suspect in the failed July 21 bombings in London.

Stockwell Mosque asserted in its letter to a senior district police official that Hamdi Issac, alias Osman Hussein, was among a group of people involved in "inciting racial and religious hatred in the community".

It said the group had been spreading extremist views and literature, and targeting moderate leaders of the mosque for abuse.

Meanwhile, an Australian Muslim scholar on Sunday used a rally commemorating the 60th anniversary of the dropping of the atomic bomb on Japan’s Hiroshima to call for an end to the United States-led war in Iraq.

Sheikh Issa Musse told the 500 people gathered in the southern Australian city of Melbourne that Australia should pull its troops out of Iraq, reported AFP.

"It is ironic that since 1945 the Americans are still dropping bombs," he said.

"How many people have died as a result of American intervention in the world? Countless, countless people have died."

"We say to the Australian government to bring our troops home very, very soon... we want our country to be respected," he said.

The Melbourne rally followed those attended by hundreds of Australians around the country on Saturday, including one in Sydney which attracted some 1,000 marchers and called for the end to the war in Iraq and to nuclear proliferation.

London Mayor Ken Livingstone said Thursday, August 4, that Britain must withdraw its troops from Iraq in order to prevent further terrorist attacks.

Would-be London bomber Hussein, who was arrested by Italian police, told investigators that he and three fellows were motivated by the Iraq war and not by religious fervor.