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."
The government announced yesterday that around 104 schools or "settings" in England found with concrete prone to collapse are set to be closed or disrupted - on top of 52 that have already been affected this year.
Labour is calling on ministers to "come clean" and publish the full list of schools that will be impacted, as they have not yet been publicly named.
Mr Gibb said the government intended to do that "in due course" but he wanted parents to be informed by the school before they read about it in the media.
He also suggested more schools could be affected as not all building surveys have been completed.
