Police in China will fight child trafficking using the Internet, the Ministry of Public Security said Friday as it announced a crackdown on four smuggling rings and the rescue of nearly 400 children.

Human trafficking through traditional methods, such as acquaintances' introductions, has been effectively curbed, said Liu Ancheng, director of the ministry's criminal investigation department.

"But due to a strong desire from buyers, traffickers have moved to more subtle means, including using the Internet to commit their crimes," he said,