A man has been detained under the Terrorism Act by detectives investigating a major public order incident in Larne on Sunday, March 30.
The 35-year-old is the ninth person to be arrested by detectives investigating the disorder involving up to 100 men.
A senior police officer blamed the trouble on the south east Antrim UDA.
During the incident last month a number of houses were attacked in the Ferris Avenue and Knockdhu Park areas.
One police officer responding was treated in hospital.