The Border Agency ordered squatters to leave their makeshift homes in Hendon last month.
Dozens set up camp on a disused football ground, claiming they had nowhere else to go.
They were offered flights back home to Romania.
Watch the report from Rags Martel:
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They tried to drive off, pursued by the suspect on foot, before their car crashed into a fence.
"Three were standing together almost shoulder-to-shoulder in like a little wolf pack and they're staring at me...", said PC Wayne Marques.