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'There are obviously some significant implications of this, which we are managing and will take measures to secure our systems even further in the future.'
In March, 37,000 pupils at Harris Federation academies in London were left unable to access emails. It was the fourth attack on school trusts that month.
Lanesend Primary (pictured), one of the six schools affected, announced that pupils would return three days later than planned for the Autumn term due to the disruption
It is not yet known what data has been encrypted in the latest attack, but personal data of pupils and staff - including registrations, addresses, and dates of birth - are often stored on servers.