Slovak newspaper claims Threema broken by Europol in murder case
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At the time he was investigating the connections between the current government and mafia. It triggered huge protests in Slovakia. The prime minister of Slovakia was forced to resign.
Marian Kocner is a suspect of ordering the murder. Apparently he was using Theema to do that.
This is an investigation of high-profile murder so I assume they have resources to do either of these.