How to win friends in Madrid.

Undercover police attempting to incite violence are caught on tape.

This video is explained in the following story:

http://www.guardian.co.uk/world/2012/sep/29/spain-riot-police

Cristina Cifuentes, the government delegate in Madrid, had warned before the protests that they were being infiltrated by violent members of Spain's far right and were attracting the country's most radical leftwingers. But protesters later pointed to a group of undercover policemen who, they claimed, had been at the front of the protest waving red flags and encouraging others to violence.

Other police certainly thought their undercover colleagues were troublemakers, and there is also film of one of them being dragged out of the crowd to be arrested and shouting: "I am a colleague! I am a colleague!"

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In this clip, the undercover officers are pilloried by the man filming.