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Police said Thursday they had arrested more than 800 people across Europe after shutting down an encrypted phone system used by organised crime groups to plot murders and drug deals.
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French and Dutch police said they hacked into the EncroChat network so they could read millions of messages "over the shoulders" of suspects as they communicated with custom-made devices.
Britain said it had arrested 746 people as a result of the operation in what it called a "massive breakthrough" against organised crime, while the Netherlands held more than 100 people and there were arrests in Norway, Spain, and Sweden.
EncroChat sent a message to its estimated 60,000 users in June warning them to throw away their 1,000-euro devices as its servers had been "seized illegally by government entities". It has now been shut down.
"It was as if though we were sitting at the table where criminals were chatting amongst themselves," said Jannine van den Berg, Chief Constable of the Dutch police's central unit.
Some of the encrypted messages "were so worrying that it went far beyond our imagination," van den Berg told a press conference at the headquarters of the EU's judicial agency Eurojust in The Hague.
'Violent crimes'
Police used the hack to foil crimes including "violent attacks, corruption, attempted murders and large-scale drug transports," Eurojust and the EU police agency Europol said in a joint statement.
"Certain messages indicated plans to commit imminent violent crimes and triggered immediate action."
French authorities launched the investigation in 2017 after finding that EncroChat phones were "regularly" found in operations against criminal groups and that the company was operating from servers in France.
They then "put a technical device in place to go beyond the encryption technique and have access to the users' correspondence," the statement said.
Dutch police then became involved based on information shared by French police.
Between 90 and 100 percent of EncroChat clients were linked to organised crime, according judicial sources, with between 50,000 to 60,000 of the phones in circulation.
The devices had most normal smart phone features stripped out and had pre-loaded apps for instant encrypted messages, plus a kill code which wiped them remotely.
EncroChat sent what it called an "emergency" text to its users on June 13 saying it had been compromised.
"Today we had our domain seized by government entities," said the message. "You are advised to power off and physically dispose your device immediately."
'Millions of messages'
The joint Dutch-Franco investigation team unearthed a "colossal number of encrypted data," Carole Etienne, the public prosecutor for the FrenRead More – Source
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