Investigators from China and Japan have announced this week that there was no possible, deliberate contamination of the Chinese-made dumplings. This is because they say the manufacturing plant in question is strictly managed.

Chinese and Japanese investigators say they've found no abnormality at a Chinese plant at the center of a food safety scare over frozen dumplings.

Both sides say, the Tianyang Food Plant in Hebei Province is very clean and well managed. They add that no abnormality has been detected.

Previously, some Japanese reported falling ill after eating the frozen dumping, with 10 diagnosed with pesticide poisoning.

Investigations by Japanese police indicated the poisoning case was more likely a deliberate one, rather than a food safety scare.

Wei Chuanzhong, deputy chief of the General Administration of Quality Supervision, Inspection, and Quarantine (AQSIQ) met with the Japanese investigators after their investigation tour of the food company.

Officials from AQSIQ say China will continue to step up checkups in the production, packaging, and transport of food products made by the Tianyang Food Plant. And the country is always ready for a joint investigation with Japan to seek the truth behind the case.

Wang Daning, Director of Food Import & Exprot Safety Dept. AQSIQ, said, "Both sides agree that we will be able to find out the truth behind the case. China is willing to work with Japan to set up a long-term food safety mechanism between the two neighbors. We hope the case will not damage our relationship."

Head of the Japanese investigators say they have seen all they need to see in China, and the Chinese food company has been very cooperative with their investigations. The Japanese side says it hopes to get more support in later investigation.

Last month, Japanese authorities found insecticide in the vomit of the poisoned people and food packages at their houses. But tests showed the rest of the dumplings from the same batches sold in Japan, totaling over 2,000 packages were safe, so are the other Chinese products.

Earlier reports say while suspicious clues such as small holes on some packages remain inexplicable, it's currently quite clear, that the food are not likely to be contaminated during the production and transportation process in China.