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1 November 2010, 15:49 | Updated: 1 November 2010, 15:59
Police have discovered two cannabis factories containing more than 2,000 plants in Cambridgeshire.
It's estimated the plants have a potential street value of £750,000.
Officers found the first factory in Westry, near March, just before 1:00am on Saturday.
It's after a burglary was reported at the property in Woodville Drive by an off-duty police officer.
Two warehouses, that had been converted for producing cannabis, were found at the site.
About 1,300 cannabis plants were discovered there.
Two cars that were at the scene left before officers arrived but officers chased two men who ran off into a nearby field.
Two men were arrested after the Cambridgeshire Police helicopter and police dogs joined the chase.
One of the cars that left the property was then stopped on the A141 and another two men were arrested.
While officers were searching the house in Woodville Drive, their investigations uncovered another factory in Commercial Road, March.
The property in Commercial Road was then raided by officers at 9:15pm yesterday and a further 960 plants were seized.
Officers are still at the scene of the second cannabis factory and investigations are continuing.