AS IT HAPPENED
- News updates on the teachers' strike
- Pictures, analysis and reaction from 26 March
Good morning and welcome to our live coverage of the teachers' strike.
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Thousands of children are facing disruption as members of the National Union of Teachers (NUT) stage industrial action over pay, pensions and conditions.
During a strike in October more than 3,000 schools were shut or partially closed in London, Cumbria, the South East, North East and South West.
The NUT says the one-day action is against:
The industrial action has been condemned by the Department for Education which says it will disrupt parents' lives and damage children's education.
Today's walkout affects schools in England and Wales. It is the third national strike since 2011.
Scotland and Northern Ireland are not affected.
More than 460 schools will be partially closed and nearly 300 completely shut in Wales as a result of the action.
Parents are advised to check council websites.
As thousands of teachers go on strike, BBC News looks at why they are taking the action.
In Cornwall the local authority says 63 out of 272 schools have reported they will be either fully or partially closed as a result of the national teacher strike.
A list of the closures known so far can be found here.
Yvonne Carr, the NUT representative at Sowerby Bridge High School in West Yorkshire, said: "People only go on strike when they're desperate.
"It's a desperate last measure to get this government to listen to the fact their changes will be detrimental for education - not just for teachers today but for the next generation of children to come."