A New South Wales public school has floated plans to keep a register of students who pray together during breaks as concerns build around the Baird government's audit into school prayer groups.

Parents at Marsden High school in Sydney's north-west were last week issued a letter citing a "federal government requirement" that a register of attendance be taken during prayer meetings and informal prayer groups.

Guardian Australia understands the letter was sent on the school's own initiative, and not in response to a federal or state government directive.

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