The apparent successor to Chechen militant Doku Umarov, who was reported dead today, has issued a video message assuming the leadership of the Caucasus Emirate group.
The YouTube video was posted on the same website which earlier reported Umarov's death.
Speaking in a mixture of Arabic and Russian, Ali Abu Muhammed said "our brother" Umarov had passed away and that he was now taking on his position.
More top news
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".