Wellington: A notorious internet message board with connections to the Christchurch mosque attacks and other mass shootings is being investigated over child sex abuse content.

Authorities in the Philippines, where the owner of the site lives, said the investigation began after they had received requests from overseas agencies to monitor it.

8chan has been the site of choice for a number of mass shooters. Credit:

"They informed us that [Jim] Watkins migrated to the Philippines and he's connected with some sites that are questionable in nature - we're looking at 8chan," said Attorney Victor Lorenzo, head of the cybercrime division of the Philippines National Bureau of Investigation.

Watkins, a US citizen who now lives in the Philippines capital, Manila, has owned 8chan since 2014.