The OSCE observers detained in the Ukrainian town of Slaviansk by pro-Russian separatists have been freed, news agency RIA reports citing the Russian envoy.
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The singer had been tweeting in support of migrants when she was bombarded with abusive messages.
Ministers are reportedly considering plans in a bid to lower inward migration.
In a tweet on Saturday, the US president didn't give a reason for his absence but said he wished"everyone well and have a great evening".