Britain's 12 largest mosques announced on Wednesday they "condemn" the actions of militant group Islamic State today, telling Newsweek the group is "un-Islamic to the core".

"Leading Islamic centres condemn the inexcusable actions of the group calling itself "Islamic State" (IS), and the indefensible murders of James Foley and Steven Sotloff. We hope that any other hostages who may be held by IS will be released unharmed," the statement reads.

"We urge our youth not to contemplate going to Iraq or Syria to join IS or any similar groups that spread violence and hatred, nor to give them any kind of support whatsoever."

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