More than 1,500 pupils have been sent home from the William Howard School in Brampton after problems with the water supply.
Engineers from United Utilities have been working with local contractors to try and establish the fault.
Pupils were sent home after after registration at 9.20am.
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LHG Live, organiser of the upcoming Olly Murs concert, says it's re-examining all security measures and making adjustments.
The project begins in July, to repair the main route to the West Cumberland Hospital.
Here's a list of road closures and speed restrictions that will be in place over the event.