An activist who campaigns to make the streets safer captured the shocking moment a thief snatched his camera before smashing it against a wall to destroy it.
Richard Taylor was making a film about cars being allowed to park in new cycle lanes when a man grabbed his camera and ran off with it.
He chased the thief into an alleyway in Cambridge and shouted 'Oi come back' and 'stop' repeatedly as the incident unfolded in broad daylight.
The unidentified man was then seen smashing the camera against a wall as Mr Taylor asks him, 'What are you doing?'
He can then be heard on the footage saying: 'Now you've destroyed it can I have it back?'
The man then casually dumps it on the floor and walks off without a word, leaving the camera and its tripod laying on the path.
Writing on his website, Mr Taylor said he reported the matter to police after finding his equipment damaged beyond repair.
He said he suspected the act, which took place on Tuesday evening, was 'motivated politically' by opponents to his reporting local issues across the city.
He wrote: 'The person who took the camera made as if to start coming towards me but, perhaps on seeing I was recording what was happening on my phone, walked off.
'I am now left without my usual equipment which I put significant personal investment into, and have been using for many years to report, and lobby, on a range of matters including seeking to tackle violent crime, improve our local health services, help people find appropriate places to live and make it safer and easier to get around the city.
'Engaging with how we run our society is often challenging but this is the first time I've faced behaviour like this.'
A spokesman for Cambridgeshire Police said the matter was being investigated.