Loyalist paramilitaries have been accused of involvement in the alleged murder of missing shop assistant Lisa Dorrian.
Walls have been daubed with graffiti in the Co Down village where she disappeared during a late night party almost two weeks ago.
Her body has yet to be recovered but as police intensified their search, the Loyalist Volunteer Force has been blamed.
Messages painted on the entrance of the village's Moatlands Estate say `PSNI: ask the LVF where Lisa is' and 'LVF drug-dealing scum'.
Even though her body has not been found, the massive hunt for the shop assistant has been turned into a murder inquiry.
Police returned today to carry out house to house inquiries in the Co Down village. They asked householders if they noticed any suspicious people in the area on the night she disappeared and also appealed for caravan owners to return to the park where she was last seen.
Ms Dorrian , who lived 10 miles away in Bangor, went missing after leaving the party in the early hours of February 28.
Two men arrested and questioned about her murder were released without charge yesterday.
Air and land searches have been carried out along the Co Down coast, with police divers also brought in to strengthen the effort.
The detective in charge of the inquiry, Chief Inspector Mark Dornan, said: "It has been necessary for police conducting the investigation to open some caravans with the permission of site wardens.
"However, as far as possible we want to work with caravan owners."