Justin Bieber was among a cast of A-list celebrities attending Floyd Mayweather's world title fight against Saul Alvarez in Las Vegas, and the pop star joined the American boxing champion after his win.
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The Prime Minister will say Moscow's brazen flouting of international law represents a threat to the basis of democracy across Europe.
In some cases, victims of violence and other serious crimes face long delays as forces are unable to dispatch officers promptly.