sentences:  The Chinese ambassador carried the torch through Chinatown after an unpublicized change to the route amid security concerns.The torch made an unscheduled move onto a bus along Fleet Street amid security concerns and efforts to evade the protesters.In an effort to counter the pro-Tibet protesters and show their support for the 2008 Beijing Olympics, more than 2,000 Chinese also gathered on the torch route and demonstrated with signs, banners and Chinese flags.