Guangdong police say they have discovered a baby-smuggling operation that allegedly bought and sold more than 30 babies in four years. Police in Yunan city have arrested 24 people believed to be involved in baby trafficking in southern China. Some suspects are still being sought. Yunan officers received a call on July 6 saying that two people were involved in selling children. The group had allegedly purchased two 10-day-old baby boys and planned to sell them to a middleman for 7,500 yuan (HK$7,050) each. Police say one of the babies was then sold for 9,000 yuan to a family in Xinyi county, Guangdong. The middleman was arrested before the second sale. Police believe they were tipped off by a family who had wanted to buy one of the babies and were angry that they were passed over in favour of another buyer. Investigators claim three of those arrested have admitted to buying more than 30 babies since October, 1998. They bought them for 6,500 to 8,000 yuan each and resold them to the middlemen for 8,000 to 12,000 yuan. The babies were then sold to people in different towns of Yunan county. Police said they are trying to locate the babies but only have the memory of the suspects to rely on for information, making the search difficult. So far, officers have located 23 babies. One of them died in March from an intestinal illness. DNA tests will be carried out to help identify the babies and find their parents.