A man has been arrested in connection with comments posted to the activist news site Indymedia.
The postings on January 21 included the personal details of a prominent High Court judge who had earlier that day handed down prison sentences in a landmark animal testing extremism trial.
A spokeswoman for Kent Police said the arrest was made this morning in Sheffield. No further details about the man, who has not been charged, were released. His arrest follows Kent Police's seizure of an Indymedia server in Manchester on January 22.
The two user comments that prompted the investigation were posted on Indymedia in response to a story about the jail sentences given to members of Stop Huntingdon Animal Cruelty (SHAC). Mr Justice Neil Butterfield handed down sentences of between four and 11 years for blackmail to three women and four men after they were convicted of harassing people and companies connected to Huntingdon Life Sciences (HLS).