Plain clothes police officer brazenly stole four bikes in a crowded city centre – but no one reported the crimes.
Tourists and shoppers turned a blind eye to the incident, which proved just how easy it is to get away with committing a crime.
In a bid to stop people being targeted Cambridge Police decided to carry out the experiment in the city which has been dubbed the UK’s cycling capital, Cambridge News reports.
Latest data from police.uk showed that in October and November 2017, 204 bikes were stolen in the city centre.
And after more than 7,000 bikes were snatched in the county in 2016/17 – and 1,099 being taken from the city centre between July 2016 and June 2017 – the force created a video to see how easy they were to steal.
They said most were taken because they were left unlocked, with a poor-quality lock or because they weren’t locked to anything at all.
In the footage, bikes can be seen leaning against railings in the city.
A man walks over and starts looking at them before brazenly taking one of the cycles away.
And surprisingly not one person seems to bat an eyelid.
Trying a bit harder to get people’s attention, the clip then shows a plain clothes officer using orange bolt croppers to "steal" one of the bikes.
He can be seen tugging at a bike locked to a fence before reaching into his bag to get the tool.
He breaks the lock and manages to get the bike – in front of others who don’t appear to take any notice.
Another location is also tried where a person takes a bike from beside a bin.
But despite lots of people walking past – none of them called 999.
Since the experiment the police force is urging people to better secure their bicycles.
They are asking people to protect their property by buying a D lock and fixing it to a solid fixed object.
And urging people who see something suspicious to report it.
A force spokeswoman said: "There are many ways in which you can help to prevent yourself becoming a victim of cycle theft such as using a heavy duty padlock to secure your bike, even considering two different types of locks and where possible, lock it to cycle racks in busy, well-lit areas."