About 75,000 voters in northwest England are about to make a significant decision. They will vote in a contest that could choose the U.K.’s next prime minister or add more chaos to British politics.

After a Sudanese man stabbed a Northern Irish man, dozens of masked men targeted homes occupied by people of immigrant origin. As in recent similar episodes, far-right activists are exploiting the incident and amplifying it on social media.

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Brexit was “an incredibly traumatic process both for the U.K. and the E.U.,” experts tell TIME, but a reunion would come with its own set of complications.