Ninjas scared off three men who were attacking a 27-year-old German medical exchange student in an alleyway outside their warrior school, the Sydney Morning Herald newspaper reported on Wednesday.
One of the teachers saw the attack and instructed the students, who were decked out in their black garb, to go out and confront the muggers.
"You should have seen their faces when they saw us in ninja gear coming toward them," the school's sensei, or master, Kaylan Soto, told the newspaper.
Another ninja, Steve Ashley, said: "It was probably the worst place in Sydney where they could have taken him."
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