Updated at 6.17pm: Ten men from Guangdong were arrested for working illegally in Hong Kong, a government spokesman said on Thursday. Immigration Department of Hong Kong officials raided two targeted flats in Nathan Road in an anti-illegal worker operation on Thursday, Officers found the 10 illegal workers renovating one of the flats. The 10, aged 32 to 47, were arrested on suspicion of breaching conditions of stay. 'Visitors are not allowed to take up employment, whether paid or unpaid, without the prior permission of the Director of Immigration,' the spokesman said. According to the law, offenders are liable to prosecution and, upon conviction, to a maximum fine of $50,000 and imprisonment for two years. The spokesman said it was also an offence to employ people not lawfully employable. The maximum penalty is a fine of $350,000 and imprisonment for three years. Investigations to locate the employer of the 10 workers were continuing, the spokesman said.