Not all schools impacted by concrete safety fears have been contacted and it is not clear how many will have to shut fully, a minister has admitted.

Schools minister Nick Gibb said in most cases “just a few buildings” or rooms within the affected schools will have to shut but “in some cases it will be the whole school”.

Asked whether all affected schools have been contacted, Mr Gibbs told Sky News: “The vast majority have, we’ve been calling them yesterday. But there is a few more that we’re calling today.”

However, asked for a number on the full closures, he said: “We don’t know yet.”

It comes after the government announced school buildings in England made with a certain type of concrete prone to collapse will be closed immediately.

The type of concrete forcing the closures is Reinforced Autoclaved Aerated Concrete, known as RAAC.

Around 104 schools or “settings” are set to be disrupted – on top of 52 that have already been affected this year.

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However Mr Gibb admitted not all schools affected had been told, saying only that the “vast majority” had been contacted.

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