Does anyone know what M15 means in the following context?

"And we are again at war albeit with an unseen enemy whose poisonous tentacles have the potential to reach into every corner of our world. At the time of writing, according to M15, the current UK threat level for international terrorism is "severe" – which means that an attack is likely."

The paragraph above is from this article: http://www.telegraph.co.uk/news/uknews/terrorism-in-the-uk/12109626/Its-time-to-bring-back-national-ID-cards.html In case you need more context I can't find anything useful on the internet. Thanks!

closed as off-topic by TimLymington, Edwin Ashworth, David, Mitch, RaceYouAnytime Sep 18 '17 at 15:47

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  • 4
    It's a typo: en.wikipedia.org/wiki/MI5 – michael.hor257k Sep 17 '17 at 10:34
  • It always surprises me to see these typos. After all, the I is nowhere near the 1 on the keyboard, and everyone in Britain knows it should be an I, and the article is in a UK paper. Just how ignorant or incompetent would the typist need to be, therefore, to put a 1? – rjpond Sep 17 '17 at 11:19
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    I'm voting to close this question as off-topic because it is based on a typographical error. – TimLymington Sep 17 '17 at 11:27
  • @rjpond - It would be very easy to transcribe the handwritten text incorrectly. – Hot Licks Sep 17 '17 at 12:00
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    @michael.hor257k The word "typesetting" is still used, even though it no longer involves literally setting type. – David Richerby Sep 17 '17 at 14:10

I believe that this is most likely a typo, meaning to say MI5.

The fact that the UK Terror Threat levels are shown on the MI5 website shows that this was most likely a typo. Also, a Google search for M15 returns with nothing, as you specified in your question.

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