Nicola Sturgeon said her party's manifesto before a local election next month would say there should be a referendum "if there is clear and sustained evidence that independence has become the preferred option of a majority of the Scottish people".
Scotland’s referendum stirs Kashmiri demands for vote on future
"Or if there is a significant and material change in the circumstances that prevailed in 2014, such as Scotland being taken out of the EU against our will," she added in a statement.
Britain is to hold a referendum on June 23 on whether to remain in, or leave, the 28-member EU bloc.
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