Hundreds gathered to protest peacefully in Ferguson, Missouri after a curfew was declared by the state's governor. Violence erupted following the shooting of an unarmed teenager last week causing civil unrest.
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The popular game relies on Google Maps, a problem in South Korea as those functions are limited by the government.
A Met Office warning covering much of England and south-east Wales is expected to remain in place until 11am.
A band of cloud and patchy rain is expected across Scotland and Northern Ireland, moving southeast as the day progresses.