The official Twitter of a publisher of the Attack on Titan manga made a statement about the manga's copyright infringement, check out the publisher's statement below:
“Kodansha is taking strict action against illegal uploads.
We are currently working on identifying the root cause of the leaks. All illegal uploads are under discussion with the police. We hope everyone continues to enjoy our official products.”
Attack on Titan is published in Bessatsu Shounen , the next issue of the magazine will be released on January 9th. Furthermore, the 33rd volume of the manga will be released on January 8th.
The author then revealed last month that there is around 2% left to complete his work.
Source: ANN