Over 1,000 pupils at a secondary school in Harpenden have had a shorter day than normal, because of a power cut.

A spokesman for Sir John Lawes School, Manland Way, said it had to be closed at about midday today (Wednesday) because of an external fault to the power supply.

He said that students were kept in their form groups until they were able to be sent home early, after parents were contacted.

The spokesman added: “Unfortunately we had to make the decision to send all pupils home early because of the power cut.

“But engineers have been working on the fault, and some of the power is back on already (as of 1.30pm).

He said some students remained at Sir John Lawes in form groups, as teachers had not obtained permission from parents for them to leave early. They will stay until permission is granted, or leave as usual at the end of the school day.

The spokesman said the school will open as normal tomorrow, and parents and pupils will be kept update via its website (www.sjl.herts.sch.uk), Twitter and by text.