PlaySchools are being urged to be vigilant about potential cases of forced marriage as the summer holidays approach.
Guidelines have been issued to teachers, doctors and police to help identify and tackle the problem.
Foreign Office minister Chris Bryant insisted every school should be looking at the issue as he acknowledged some may have been "uncertain" about cultural sensitivities.
The summer break is a peak time for incidents of young people, usually girls, being taken to south Asia in particular and forced by their families to marry.
Latest figures from the Government's Forced Marriage Unit suggest that 70 per cent of cases involved families of Pakistani origin and 11 per cent of a Bangladeshi background.
Asked whether schools were turning a blind eye to the problem, Mr Bryant said: "I'm not sure that's true. But I would say to every school that they should be looking at this.
"It may be possible that some have been uncertain about the cultural issues here.
"But I should make it absolutely clear there is no culture and there is no religion in which forced marriage should be acceptable or indeed is acceptable."
There have already been 770 calls to the Forced Marriage Unit so far this year, a 16 per cent increase on the same period last year.
But there is concern that many youngsters affected are frightened to come forward and make their plight known until it is too late.
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