Police in the UK have warned people not to take the law into their own hands as they bid to help in the search for missing dog walker Nicola Bulley.
Officers have been forced to stop a group from entering a derelict house near the river where the missing mother of two vanished last month.
The group, who are believed to have travelled to Lancashire from the Liverpool area, were apparently issued a dispersal order last night.
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Lancashire Constabulary has also said it "will not tolerate" people committing criminal offences by breaking into empty or derelict riverside properties even if they think they are helping in the investigation.
And speaking from the scene on Wednesday evening, TalkTV's Oliver Whitfield-Miocic said: "The police here have just had to issue a dispersal order to a group of men believed to have travelled down from the Liverpool area.
"They wanted to go and search this abandoned house on the other side of the river where police believe Nicola Bulley had accidentally fallen in.
"All of this despite the police already having searched that area and, only 24 hours ago, the Superintendent in charge of this investigation asking people not to take the law into their own hands."
Ms Bulley, 45, went missing on January 27 in St Michael's on Wyre, Lancashire.
In a press conference on Tuesday, Superintendent Sally Riley said: "We will not tolerate online abuse of anyone, including innocent witnesses, members of the family and friends, of local businesses, or of criminal damage or burglary.
"We will be taking a strong line on that, as you would expect."
Ms Riley also told reporters: "There are some properties along the riverside which are empty or derelict.
"Whilst it may be well intentioned that people think that that could be a line of inquiry, I would ask them to desist from doing that.
"In some cases it may be criminal if they are breaking in and causing damage or committing a burglary."
She said officers have searched derelict riverside properties with the permission of owners.
"Because there is no criminal element yet identified, and we don't expect there to be in this inquiry, then we're not starting to go into houses because that's not where the inquiry is leading us," she added.
Ms Riley also urged the public to avoid "distressing" speculation about what might have happened to Ms Bulley.
"We would ask that people in the wider community, particularly on social media and online, do not speculate as to what may have happened to Nicola," she told reporters at the press conference.
"This is particularly hurtful to her family, to her children, to her partner Paul, to her parents, her sister and her friends because it is not helpful to them, it is distressing and it is distracting for the police inquiry.
"Nor is it helpful if people, particularly if they have come from outside of the area, take it upon themselves to take the law into their own hands by trying to, for example, break into empty property.
"They may mean well, they may want to help. But they can help in thinking back if they were in the area to what information they may have of relevance to the police and holding the family in their thoughts."
Peter Faulding, leader of underwater search experts Specialist Group International (SGI), helped to search the river after being called in by the family.
Mr Faulding has said if his team does not find her in the water using his sonar equipment then he believes she has not been in the river and raised "third party" involvement in the disappearance.
But Ms Riley told reporters at a press conference in the village that Mr Faulding is not included in "all the investigation detail".
She added: "Our search has not found Nicola in the river and then a re-search in parts by SGI has found the same. That does not mean... that Nicola has not been in the river.
"In the light of other inquiries being discounted from the investigation so far... clearly our main belief is that Nicola did fall into the river.
"Clearly Mr Faulding isn't included within all the investigation detail any more than the members of the public are that I'm briefing through these sorts of press conferences."
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