Projectors made to look like CCTV cameras have been found in the G20 restricted zone around the convention centre.

Several of the dummy cameras were discovered by police this week only days before world leaders are due to visit the city.

A police source said the cameras were designed to project anti-G20 slogans onto flat surfaces.

It’s understood they could be triggered remotely by a mobile phone.

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The source said it appeared the cameras had been attached to buildings inside the restricted zone in a well planned campaign to convey an anti-G20 message during the duration of the event.

They said investigations were continuing into who was responsible for mounting the cameras.

Police would view CCTV surveillance from surrounding buildings in an attempt to identify those responsible.