MUMBAI (Reuters) – Websites like Reddit and Telegram are being blocked in India by internet service providers, throwing into question the enforcement of net neutrality rules, advocacy groups said on Wednesday.

Restrictions on “torrent sites” that offer free movie and music downloads are routine in India to prevent copyright infringement. Pornography websites are also blocked by court orders seeking to protect children.

But in recent months, websites such as the discussion board Reddit, messaging service Telegram and comedy site College Humor have been blocked for intermittent periods, often for days and only in some regions, baffling internet users.

“It’s not making any sense, what’s happening,” said Apar Gupta, executive director at the non-profit Internet Freedom Foundation (IFF). “A lot of these blocks are also happening in such a way that no notices are displayed.”