CHRISTCHURCH, New Zealand — Hoping to limit the spread of hateful ideas attributed to the suspect accused of the Christchurch killings, New Zealand classified his so-called manifesto as “objectionable” on Saturday, making it a crime to possess or distribute it anywhere in the country.

“People who have downloaded this document, or printed it, should destroy any copies,” said David Shanks, the chief censor in New Zealand’s Department of Internal Affairs.

“There is an important distinction to be made between ‘hate speech,’ which may be rejected by many right-thinking people but which is legal to express, and this type of publication, which is deliberately constructed to inspire further murder and terrorism,” Mr. Shanks said. “It crosses the line.”

The ruling is part of a wider strategy by Prime Minister Jacinda Ardern to undermine the attempts by the suspect, Brenton Harrison Tarrant, to gain global notoriety. She has pledged never to utter his name publicly, and to press platforms like Facebook to deny access worldwide to the manifesto, which was published just before the slaughter of 50 people in two mosques, as well as the video the gunman apparently livestreamed of part of the attacks.