Anyone who has information about the murder of Bangor woman Lisa Dorrian should come forward before her killers strike again, a loyalist MLA has said.
Lisa left her handbag and personal belongings behind at a party
Lisa, 25, disappeared after a party at a County Down caravan site last month.
Progressive Unionist Party leader David Ervine said the only way to help was to talk to the police, despite suggestions of paramilitary involvement.
"Those who have abducted, or maybe murdered, Lisa have nothing to offer this society," he said.
Lisa has not been seen since a party at a caravan on a site in Ballyhalbert on 28 February.
On Wednesday, police revealed four members of the public have given them information following an appeal by her family.
Mr Ervine said that police were being hampered either because "there were lies being told or there are people refusing to come forward".
He made his appeal after he met Detective Superintendent Pat Steele, who is leading the murder investigation.
David Ervine has said people must go to the police
"Clearly there are people on the periphery of what happened to Lisa who are not telling all that they know. It's fundamental that they tell what they know," he said.
"Because perhaps they were dabbling in a bit of drugs, doing silly things, they maybe feel that because they were doing some wrong that they should stay back.
"We're not interested in the drugs. Where's Lisa?"
Three men who have been questioned about the killing have been released.
When she disappeared, Lisa, a shop assistant, left her handbag and personal belongings behind her and has not made contact with friends or family since.
Mr Ervine, whose party is linked to the loyalist paramilitary group the UVF, said people should not be afraid of going to the police.
"What I do know and what I'm very confident about is that no organisation is going to take retaliation against those who give evidence against these evil people.
"What would it be like in six months time or a year's time when they do it again, because the sense of power, the imbibing of drugs all of that and getting away with it - for all that we know they've done it before.
"What we have to do now is ensure they don't do it again."