"Alexander Bastrykin instructed to carefully study all versions of what happened, to ensure the further conduct of search activities ... The progress of the investigation of the criminal case has been put under control in the central office of the Investigative Committee of Russia," the statement says.
Earlier it became known that the government of the Tyumen region has appointed a reward for information about the missing girl.
At the end of June, eight-year-old Anastasia Muravyova was reported missing in Tyumen.