The parents of a Chinese boy who was rescued a little over a week ago after being kidnapped were arrested Monday for allegedly being in Japan illegally.

He Huoguang, 37-year-old employee at a Chinese noodle shop in Adachi Ward, Tokyo, and his wife, Chen Dingying, 39, were arrested on suspicion of violating the immigration control law, police said.

Their son, He Risheng, 6, was kidnapped for ransom June 6 by a group of men and women believed to be Chinese nationals and a Malaysian. He was rescued unhurt June 8 in a police raid on a condominium in Naka Ward, Yokohama. Some of the suspects know the parents.