This is an English translation of the letter from the NOS hostage-taker, as published at http://www.rtlnieuws.nl/nieuws/binnenland/lees-de-brief-van-de-nos-indringer and various other places.

Translation by @joepie91 (Sven Slootweg, http://cryto.net/~joepie91), free to reuse and redistribute under WTFPL/CC0 (ie. no restrictions or requirements whatsoever, effectively public domain). Restrictions may apply to the original work.

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When you read this, do not panic. Do not shout and don't warn colleagues. Act like nothing is wrong. I am heavily armed. If you cooperate nicely, nothing will happen to you. Realize that I am not on my own. There are five others, plus 98 hackers who are ready for a cyber attack. Additionally, in the country eight heavy explosives have been placed that contain radioactive material. If you do not bring me to studio 8 to take over a broadcast, we will have to take action. You don't want that on your conscience, do you? So accompany me now to Studio 8, the NOS studio.

[below part presumably meant to be read out on a live broadcast]

We have been taken hostage by heavily armed men in Studio 8, at the Media Park Hilversum. There are more of them in the rest of the country, and they have 98 hackers ready for a cyber attack. Eight heavy explosives have also been placed in the country, containing radioactive materials. They want to do a live broadcast to share their story. If this live broadcast is interrupted in any way, they will take action. On the outside, there will be people making sure that the live broadcast can be seen throughout all of the Netherlands. Their demands are therefore, including but not limited to, 1. The building will not be stormed. 2. The live broadcast will not be delayed, not interrupted for even a single second, and not edited whatsoever. 3. To be clear; no information bar and no subtitles are to be added to the live broadcast. If the demands are complied with, we will be released. I will repeat this once more.