The Daily Mail Online is an online news outlet in the UK which provides a comment section for each new article they publish. Sometimes the comment sections are moderated and other times they are turned off entirely. On their FAQ page they say this is "usually for legal reasons":
Why are comments not allowed under some articles?
We do not allow comments under some articles or blogs. This is usually for legal reasons.
Despite this the Daily Mail still runs a Twitter account where they post most of their news articles including the articles that have had their comments disabled. This means people are still able to comment on the news article, but only from a third party website.
At this point it seems more likely they are disabling the comment sections because they don't have the resources to moderate a very popular news story.
Before I jump to conclusions, are you aware of any legal reasons why they would have to disable the comments section on their website?