Sixteen men sleeping rough under a bridge in west London have been arrested.
The men, who were living under the M4 bridge in Hounslow, were held after a raid by the UK Border Agency (UKBA).
Two others needed hospital treatment, one of whom has tuberculosis. The area will now be cleaned.
BBC reporter Alice Bhandhukravi, who was at the scene, said there were needles on the floor and that the smell was overpowering.
She tweeted that the men were living in squalor and grim conditions.
The 18 men at the scene were all Indian, most of whom were in the UK illegally, according to the Border Agency.
Those in the country illegally will be deported, while those who have been released on bail will stay providing they make their bail conditions.
It is not known exactly how many were illegal immigrants or what those who have been bailed were arrested for.