Thieves have stolen wildlife cameras worth £500 from a historic site near Norwich just days after they were installed.
it is the latest incident of theft and vandalism at Caistor Roman Town which has been targeted on a number of occasions in the past six months.
Three specialist wildlife cameras and four safety signs were stolen at some point between April 13 and April 20.
Natalie Butler, director of the Norfolk Archaeological Trust which manages the site, said: "The theft is heartbreaking for us and our staff and volunteers.
"We were fortunate to get a donation for the cameras and were hoping to get to know the wildlife that lives around the site and record what we see.
"Unfortunately they have been stolen and we will not be able to replace them.
"It is really upsetting."
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Norfolk Constabulary has said that officers have "exhausted all lines of enquiry" and the case has now been closed.
Caistor Roman Town has been hit by vandals on several occasions since the start of this year.
The popular walking spot was closed in January following a spate of dog fouling and incidents of dogs being let off leads, putting the sheep that live on the site at risk.
Signage put up to protect the site's safety has since been frequently ripped off at least three times since, prompting police to increase patrols of the area.
Ms Butler added: "We can't understand why people would think it is OK.
"The signs, which are vital to ensure visitors' safety, have had to be replaced, which has taken away money that could have been spent on improving the site.
"It feels very much like we are being targeted."
A Norfolk Constabulary spokeswoman said the case will be reviewed if any new information is provided to them.
Anyone with information can call 101 or report a crime online.
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