NORTH Wales Police is warning of "aggressive" cold callers knocking on doors.

The force said it has a number of recent reports of people having knocked at residential properties trying to sell cleaning products.

Police said in some instances they became "aggressive" when householders did not want to buy items.

READ MORE: North Wales Police warns of new scam causing 'fear and anxiety'

North Wales Police said: "Do not feel obliged to open the door to strangers and if they refuse to leave or become aggressive contact the police or family/friends.

"Anyone who calls at your door should have some form of identification. You are well within your rights to ask for this and make a note of their details.

"Sometimes these callers' intentions are fraudulent, whether it’s to sell counterfeit goods or services or simply gather information about you or your property. In some cases, fraudsters may even pretend to be from your utilities company and use the excuse of needing to take  a meter reading as a way to gain access to your house."

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Police are urging people to never give out banking or personal details to anyone you’re unsure about.

They said: "If you can’t be certain if a visitor is genuinely who they say they are, ask them to come back at a later date. This gives you time to verify their identity and perhaps also arrange for a relative or friend to be there.

"Remember, it’s ok to tell visitors you’re not interested or ask them to leave if you aren’t comfortable. Legitimate visitors will understand."