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Moreover, the ministry expressed condolences to the families of those killed and to the Russian authorities and wished those wounded a speedy recovery.

Foreign Minister Karl Erjavec has already sent his Russian counterpart Sergey Lavrov a letter of condolence.

According to Russian media, authorities will probably look for the source of the two attacks, which left at least 31 people dead, while 64 are being treated in hospital, in the North Caucasus, where Islamists have been rebelling against Russia for years.