Ministers and teaching unions have been urged to "stop squabbling" and to work together to begin reopening schools in England.
Fears are mounting that Boris Johnson - who wants primary schools to begin opening their gates from June 1 - has moved too quickly with measures this week to ease the coronavirus lockdown in England.
A meeting on Friday between teaching unions and Government scientific advisers intended to reassure staff that it was safe to go back to the classroom - but it ended inconclusively.
Union representatives said they had been left with more questions than answers, with one union leader describing the scientific evidence as "flimsy at best".
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