Prince Charles has urged "every true Muslim" to root out extremist preachers in the wake of the London bomb attacks.
Prince Charles said the attacks had no link to "true faith"
An "evil influence" appeared to have been brought to bear on the suspected bombers, whose "atrocities" must be condemned, he told the Daily Mirror.
Others must resist the temptation to condemn the Muslim community for the actions of an evil minority, he added.
Tony Blair has said talks will start on new laws to make it easier to deport people trying to "incite hatred".
Muslim leaders say they are "shocked" British Muslims may have been behind last Thursday's attacks.
'No link to faith'
"Some may think this cause is Islam. It is anything but. It is a perversion of traditional Islam," Prince Charles said.
The prince said Muslim leaders were right to point out the attacks had no link to "true faith".
"Those who claim to have murdered in the name of Islam have no care for the lives they have so brutally destroyed.
"Offended by the good relations between faiths and cultures, the extremists seek to break up the communities that make up our modern, multi-cultural society," the prince wrote.
Sir Iqbal Sacranie said Islam could never justify the killings
He said Britain's tradition of welcoming new communities had to be upheld to prevent the bombers achieving their aim of dividing the community.
"We seem to be seeing a cycle, from Bali to Baghdad, from New York to London, of willing recruits sacrificing their young lives to slaughter innocent people in some inhuman cause."
But the prince also said the way Londoners had coped with last week's attacks was a cause of "national pride".
Two generations or so after the Blitz, the resilience and courage of Londoners have again inspired the world."
On Tuesday, the Muslim Council of Britain's secretary general, Sir Iqbal Sacranie, said: "Nothing in Islam can ever justify the evil actions of the bombers.
"They happen to be Muslims and it's not that Islam is the problem, it is those individuals, it is the criminality that is there," he said.
On Wednesday, Mr Blair met Muslim MPs to discuss how to tackle "this evil within the Muslim community".
"In the end, this can only be taken on and defeated by the community itself," he said.
The prime minister condemned any attacks on British Muslims, saying the vast majority were decent and law abiding.