Police have concluded the investigation into a Shanghai company manufacturing contaminated milk and milk powder, and handed the management over to the prosecutor's office for criminal prosecution, prosecutors said Tuesday.

In a government inspection tour in April, the Shanghai Panda Dairy Co. Ltd. was found producing milk powder and condensed milk with unacceptably high levels of melamine, which can cause kidney stones and kidney failure.

The government shut down the company and sealed up all its stocks. No damages were caused in the society as all the products were recalled, the police department said.

The corporate representative of the company, general manager and deputy general manager had been arrested following the discovery.