The UK Border Agency arrested three people for being in the country illegally in Maidenhead on Wednesday.
Two men from Pakistan were arrested after officers, acting on intelligence, visited AK Barbers in Queen Street at about 12.45pm and carried out checks on staff.
One man, aged 27, was detained for entering the UK illegally and the other, also 27, for overstaying his visa.
Officers then visited a house in Grenfell Road, where they arrested a 24-year-old Indian man who had overstayed his visa.
The arrests were the latest in a series of operations by the UK Border Agency in the Thames Valley.
All three men have been detained pending their removal from the UK.
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