A total of 476 cannabis plants were discovered by police on two properties in West Yorkshire, England, on Sunday. A spokesperson for West Yorkshire Police said two men were arrested at the first property, Keighley News reported.

A total of 416 plants were found and disposed of and the two suspects were granted bail. Police did not disclose the identities or nationalities of those arrested.

At the second location, officers seized 60 plants. Police were conducting forensic investigations to identify possible suspects.

In a similar case in 2014, two Vietnamese men were caught operating a cannabis farm valued at £100,000 (US$131,499) in Leeds, West Yorkshire. A total of 500 plants were seized in the four-story house. The two men were jailed for 36 and 40 months respectively.

They claimed they were unaware of the offense and said they believed they were growing “Western vegetables” on the premises.

As many as 100 high-powered lights had been installed in the house to help the plants grow. The two men reportedly entered the United Kingdom illegally via the Czech Republic.

Illegal immigrants are often forced into modern slavery in the UK. A significant number of illegals come from Vietnam and are often made to work in salons, nail bars and even cannabis farms.

Read: Vietnamese children found working on cannabis farms in UK

Read: Four Vietnamese teenagers go missing after arriving  in UK