The World: Beijing - China extends threat to unofficial Olympics ads

Chinese authorities are cracking down on ads promoting brands that are not Olympic sponsors, but that feature people connected with the games, including athletes, coaches and officials.

The move by the China Advertising Association extends previous restrictions, which identified words such as "2008", "Beijing" and "torch" as off-limits for non-sponsors.

The ban affects brands such as Nike, which has always chosen to sponsor individual athletes rather than the Olympics themselves. Cadillac, which has been using the Chinese hurdler Liu Xiang in its ads, could also be hit.