After a beleaguered relay dogged by Tibet protesters in many of its legs around the world, the Olympic flame finally reached Beijing today. Ecstatic crowds under smog-choked skies shouted "Go Olympics, go Beijing" to greet torchbearers in Tiananmen Square, with Chinese basketball sensation Yao Ming holding the torch above "a sea of beaming faces," Reuters reports. Four British and American protesters who unfurled a giant "Free Tibet" banner near the main stadium were quickly arrested. (More Olympic flame stories.)