NEW : Fireworks , drummers in opening ceremony of Saturday . Bomb threat forces Transport Ministry to cancel some flights . President Liu Xiang among world leaders attending opening ceremony . The anticipation over the Olympics was unmistakable in China 's capital city . about 300 athletes to compete for More than 10,000 gold medals .
NEW : Fireworks , drummers in opening ceremony of Saturday . Bomb threat forces Transport Ministry to cancel some flights . President Liu Xiang among world leaders attending opening ceremony . about 300 athletes to compete for More than 10,000 gold medals .