Canvey Island Infant School has reported the incident to the NCSC.
Its headteacher says it has made the “difficult decision” to close the school for an additional day on Tuesday 3 September.
The cyber attack means teachers have been unable to prepare for the new term as they do not have access to resources on the school’s system.
A message on the school’s website says: “We have no access to emails at the moment” and encourages parents to telephone and leave a voicemail instead.
A spokesperson for Essex County Council said it was "aware of a cyber security incident affecting Canvey Infant School".
The full BBC Report can be viewed here: https://www.bbc.co.uk/news/articles/cly3e44n8v1o
We are working on helping schools improve their cyber resilience with our DfE Digital Standards Tracker.