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March factory damaged during New Year's Eve illegal rave

3 January 2013 Last updated at 11:22 GMT

A massive clean-up has started at a factory where hundreds of people at an illegal rave caused damage which will cost tens of thousands of pounds to repair.

The owner of the factory at March in Cambridgeshire took pictures of the ravers on his mobile phone.

They had assured him they would not cause any trouble if he let the party go on.

But police were called to the factory on New Year's Eve although they did not go in because of concerns about public safety.