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A further two coronavirus cases have been confirmed at a Northumberland school.
The new infections come within 24 hours of a staff member at St Benet Biscop Catholic Academy in Bedlington t esting positive.
In addition, a "small number of pupils" are now self-isolating after coming into direct contact with the confirmed cases.
In a letter to parents, headteacher Kevin Shepherd accepts parents will find the latest development "concerning".
"We are continuing to monitor the situation and are working closely with Public Health England," he added.
The letter was sent to parents on Thursday, a day after it emerged two members of staff were self-isolating.