They, along with some of the parents of suspected British jihadists, have also pledged to work with the security services to find extremists who may be planning to travel to Iraq and the surrounding countries.
The man who cruelly beheaded James, 40, spoke with a British accent and is believed to have lived in the UK.
Mohammed Shafiq, from the British Ramadhan Foundation, said they would help in every way they could.
“As Muslims we reject terrorism and the evil IS [Islamic State] – they do not act in our name and we abhor anyone who supports them,’ he told Metro.
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“We stand ready to support the police and intelligence agencies in their work to defeat terrorism and protect our nation.”
The Muslim Council of Britain added: ‘We condemn unreservedly their psychopathic violence, whether it is on minorities, on civilians, or on fellow Muslims.”
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David Cameron condemned James’ murder as “barbaric” while President Barack Obama said the US would avenge his killing.
It’s thought as many as 600 Britons could have gone to fight for IS.
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