Police say a 31-year-old Chinese national who runs a restaurant in Tokyo's Taito Ward was arrested on suspicion of violating immigration laws by employing a Chinese worker without proper status; the 26-year-old employee worked as a hall staffer without the required permission for activities outside his visa category, while the owner partly denies wrongdoing, saying he believed it did not violate the law; the worker was previously arrested in July for stealing 2 million yen from a Sapporo ATM, and investigators are examining whether other illegal workers exist.