Immigration police on Monday arrested 32 people from a factory run by Britain's biggest sandwich-maker, a media report said on Monday.
Officers carried out the dawn raid at the Greencore sandwich plant in Bromley-by-Bow, east London, as factory workers arrived for the start of their shifts, the Mirror online reported.
A total of 32 people were arrested on suspicion of immigration offences -- 10 on suspicion of criminal offences.
Nine of the 10 have since been charged and remanded in custody and one was released on bail pending further enquiries.
A further 22 people are now being dealt with by immigration officials and could face deportation.
The firm currently makes around three million sandwiches a week from plants in Worksop and Bromley-by-Bow and supermarket giants such as Asda, Sainsbury and Marks and Spencer.
The sandwich-makers could now face fines of 20,000 pounds (about $31,000) per worker employed illegally at the plant.
