Six people were detained yesterday after a group of people were spotted jumping from a trailer unit near Cosham Railway Station.
The arrests have been made as part of a joint operation between Hampshire Constabulary, British Transport Police, NPAS Bournemouth and Network Rail.
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Police suspect that the individuals are illegal immigrants.
Posting on social media, Hampshire Response Cops tweeted: '˜Further threeÂ located in Cosham Park.
'˜Massive drain on resources yesterday, thanks to response teams around the county assisting covering Portsmouth jobs whilst we dealt with this for the majority of our shift.'