A Muslim teenager was subjected to a stream of racist abuse on a Sydney bus after, according to her mother, she confronted a man she believed was photographing another schoolgirl.

NSW Police has confirmed it is investigating the incident that occurred when Janna, 13, was travelling towards Greenacre in Sydney's south-west on Thursday afternoon.

The incident is a "microcosm of the state of Islamophobia nationwide", according to the Islamophobia Register, which says it has recorded a more than sixfold increase in reports of Islamophobia since the October 7 attacks .

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