Police are urging people to be careful selling and buying products through social media 'buy and sell' pages after three incidents in the last week when a robber held a knife to sellers of mobile phones.
The third such robbery attended by Canterbury Police occurred today.
The police say in the three separate incidents, a knife was presented to the seller of a mobile phone before the offender fled with the phone, without paying.
Detective Mike Kneebone says in all three incidents the "buyer" arranged to meet in the Shortland Street area of Aranui at various times of the day.
"We believe all three incidents are linked and are following strong lines of enquiry, but we're urging those buying or selling goods through unknown people, to act with caution," Mr Kneebone said.
Police are advising those buying or selling goods online to complete transactions in a public place.
"Sales should always be completed in public, preferably with a trusted companion and in sight of CCTV cameras," Mr Kneebone said.
"Check who you are dealing with by searching for feedback and other comments relating to this seller to see what other people have experienced," he advised.
"Most importantly, if you're uncomfortable with the person you're doing the sale with, don't go through with the transaction."
Anyone with similar reports or information on these incidents is being asked to contact Christchurch Central Police Station on 03 363 7400.
Alternatively, information may also be provided anonymously at Crimestoppers on 0800 555 111.
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