The head of WA's Jewish community has urged Muslim leaders to condemn Islamic extremists publicly, warning that their silence is fuelling "suspicion" of their religion.

Chief Rabbi David Freilich joined Christian and Muslim community members in Perth on Friday to sign a petition denouncing the rise of "Islamaphobia" in Australia.

But he said what was really needed was for Muslims to send a strong and clear message to the wider community that they did not support the brutality being committed in countries including Iraq and Syria in the name of Islam.

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