Social media site Facebook is back online after a third outage in the last three months. The last time the service was interrupted briefly came on August 1.
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If no agreements are reached, the idea is for Germany then to begin turning back migrants.
Supporters have been taking trains, planes and automobiles – and even bikes – to get to England’s first match in Volgograd.
Officers were seen taking photographs of graffiti as part of their inquiries.