entered the US Chengdu Consulate for the official anti-terrorism businesses, especially as serious as the Tibet Independence issue, he would entered alone, stealthily, without a team of properly delegated associates or experts with him openly?  Any consulate in the world dares to detain a host country's high-ranking official, especially from a  power like China, who pays a visit or carries out an official business, for more than 24 hours when the 'negotiations' break down?

When there is a need to blow smokescreens or muddle the water, there is no limit of twisting and spinning.  You'll see even more imaginative stories/fictions than this one in the coming days until the whole truth is presented when the time becomes appropriate.