Police said they received a report of concern about a person's wellbeing in the Kelston area just after 2pm.
As a precaution, Kelston Boys' High School, Kelston Girls' High School and St Leonards Road School were put into lockdown.
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Police said that they were working with schools to allow students to leave.
In a post on Facebook, St Leonards Road School said all students were safe and accounted for.
Parents were asked not to come to the school or phone.