The UK Border Agency says it is working with Northampton Borough Council to deal with camps set up by homeless migrants in the town.
The latest encampment has been discovered on the site of the town's former power station.
It's thought up to three people could be living there. More at ITV Anglia.
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Harry Street, formerly Barry Williams, shot dead five people in a spree across the West Midlands in 1978.
The law was rolled out nationally in March. The Police and Crime Commissioner for Nottinghamshire has praised it's results in his area.