Teachers at Wellsway School in Keynsham are striking today.
Members of the National Association of Schoolmasters Union of Women Teachers, NASUWT, are protesting about workload. The strikes are the first of six days of planned action by the union.
The school has been in negotiation with both unions, but despite reaching an agreement with the National Union of Teachers didn't do so with the NASUWT.
In that letter, Andrea Arlidge, headteacher of the school, and head of school Simon White said the dispute was over "measures that we had taken to help improve the quality of teaching that your children receive".
Ms Arlidge and Mr White said the NASUWT was especially concerned over the "additional work" it felt these steps would involve.
Delays continue until at least 9am on First Great Western services between Bristol Temple Meads/Weston-super-Mare/London Paddington and Portsmouth Harbour and on Cross Country services between Bath Spa and Glasgow.
It follows an earlier incident on the line near Keynsham and is adding up to 60 minutes to journeys.
The family of Ben Pocock, from Keynsham, have today confirmed that he has been formally identified as one of the victims of the Malaysian MH17 air crash over Ukraine on July 17.
There are delays of up to 20 minutes on First Great Western and South West services between Bristol Temple Meads and Bath Spa after a person was hit by train at Keynsham earlier.
The line has now reopened but knock-on delays are likely until 12:30pm
A cyclist has died following a collision near Keynsham last week.
The man, in his 20s, was airlifted to Southmead Hospital after colliding with a Ford Fusion on Middlepiece Lane at Burnett on Wednesday. He died from his injuries yesterday.
Police are appealing for witnesses to contact the Collision Investigation Unit on 101.
Heavy rain has led to a footbridge in Keynsham being closed temporarily as a safety precaution.
A recent inspection by engineers of the bridge in the Memorial Park found that the riverbank has eroded.
The council says that, once the water levels have subsided, it will be clear if the structure is damaged and whether any work is needed.
A woman cyclist has been taken to hospital with serious injuries after a crash involving a car on the Keynsham bypass near Bristol.
It happened at 3.45pm on the A4 Bath Road at the Broadmead roundabout in Keynsham.
The woman is being treated at the Royal United Hospital in Bath.
It's causing long tailbacks as the roundabout is partially blocked.
A topping out ceremony will be held at the regeneration project in Keynsham today
The tradition marks the placing of the highest beam on a new building, £34 million is being spent on transforming the town centre.
Plans to build 700 new homes on the former Cadbury site in Keynsham have been given the go ahead by Bath and North East Somerset councillors this evening. That's despite concerns about emergency response times.
It's thought the development could create a thousand jobs.
But the site only has one access point which Avon and Somerset Police fear could lead to congestion.
The line between Bristol Temple Meads and Bath Spa has reopened.
It was closed earlier on Tuesday when a vehicle carrying a skip hit a railway bridge in Keynsham.
This photo was taken by ITV News West Country Journalist Ruth Wishart on Tuesday afternoon of a delayed train arriving at Keynsham.