Twelve brick kilns have closed leaving just a dozen operational, building sources said Monday. "If I travel on National Highway 6A and National Highway 5, many of the brick kilns have closed," said Sok Sovandeith, president of the Cambodia Federation of Builders and Woodworkers. A drop in demand saw prices fall from 500 riels (US$0.12) to 50 riels per brick last month. Angkor Brick and Tiles Co Ltd has survived, its owner Praing Ol said, but production is down 80 percent. Kim Long, owner of Kim Long Construction Material Shop, said that hundreds of workers had been laid off.