A man has been arrested in connection with trouble in Larne last weekend.
Police said the 40 year-old was taken to Antrim Serious Crime Suite for questioning after being arrested in Larne under the Terrorism Act on Saturday.
Last weekend between 60 and 100 men converged on Larne and attacked local people, police and property.
Police said the south east Antrim brigade of the UDA were responsible.
The latest arrest follows three other arrests in relation to the incident as well as an altercation the day before the trouble, after which three men were taken to hospital, which police believe may have been linked to the mob violence.