Dutch police and security units would have used specially secured cryptophones for years that could be tapped by the American intelligence service NSA.

This is evident from documents that radio program

Argos

has seen.

The Dutch police and the Royal Netherlands Marechaussee, among others, bought hundreds of copies of the Swiss Ascom SE 660 Crypto.

These radios and mobile radios use encryption to provide additional security for calls.

By now it would be clear that these devices contain a back door of the American intelligence service NSA.

This made it possible to eavesdrop on conversations.

It is unclear how often conversations have been actively spied on.

Used by special services

In the Netherlands, the equipment was widely used by special services, including the diplomats protection department and the Special Security Missions Brigade.

The Yugoslavia Tribunal in The Hague was also secured with the cryptophones.

Earlier this year it came to light that the back doors were placed in the cryptophones.

That was part of 'Operation Rubicon', in which the German intelligence service, together with the NSA, bought the communications company Crypto AG.

As a result of the acquisition, Germany and the United States have been able to listen in since the 1970s with supposedly secure conversations on the equipment sold.

This came to light when anonymous sources spoke to

The Washington Post

and

ZDF

.

See also: 'CIA and BND bugged governments for decades, the Netherlands helped'

Impact on the Netherlands was previously unknown

Earlier it appeared that in many countries could be tapped in this way, but the exact impact on the Netherlands was not known until now.

The documents seen by

Argos

make it clear to what extent Dutch police forces were victims.

According to an anonymous source, at least 625 of the devices were bought by the Netherlands.

A spokesman for the military police says that about 150 were in use.

The police could not yet share numbers.