Blackmail letters threatening to spread false rumours about people being paedophiles have been sent to homeowners in Maidenhead.
Four people in Maidenhead have received the letters since Thursday demanding them to purchase bitcoins, a type of cyber currency, from a specific account.
The letters threatens recipients that they will spread rumours about them being a paedophile if they do not purchase the bitcoins.
Detective sergeant Peter Wall from Force CID Maidenhead said: "Do not be alarmed if you receive a letter like this.
"Our advice is to try not to touch the letter too much so that it can be preserved for forensic examination. Do not respond to the letter or purchase any of the bitcoins."
Contact the police on 101 or Crimestoppers anonymously on 0800 555111 if you have information.
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