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Avakov said that only chief investigators and the interior minister are authorized to announce the results of the investigation.

Read alsoUkraine asks Germany to help in Sheremet murder probe"The Pavel Sheremet murder case: there will be a briefing of the minister and the heads of the investigative group next week. No one else knows the results of the probe and is authorized to make public the facts and conclusions of this investigation," he wrote on Facebook.

As reported earlier, Pavel Sheremet was killed in a car explosion on July 20, 2016. The car, being driven by Sheremet, belonged to Olena Prytula, his common-law wife and the founding editor of the Ukrayinska Pravda online newspaper.

Investigators are considering a key motivation for the murder of Sheremet as an act of revenge for his professional activities.