The Olympic torch is carried down Van Ness Avenue in San Francisco under heavy guard. The torch was rerouted away from thousands of demonstrators and spectators who crowded the city's waterfront, and made an abbreviated but successful run.

San Francisco ? The Olympic torch played hide and seek with thousands of demonstrators and spectators crowding the city’s waterfront Wednesday before being spirited away without even a formal goodbye on its symbolic stop in the United States.

After its parade was rerouted and shortened to prevent disruptions by massive crowds of anti-China protesters, the planned closing ceremony at the waterfront was canceled and moved to San Francisco International Airport. The flame was put directly on a plane and was not displayed.

The last-minute changes to the route and the site of the closing ceremony were made amid security concerns following chaotic protests in London and Paris of China’s human rights record in Tibet and elsewhere, but they effectively prevented many spectators who wanted to see the flame from witnessing the historic moment.

As it made its way through the streets of San Francisco, the flame traveled in switchbacks and left the crowds confused and waiting for a parade that never arrived. Protesters also hurriedly changed plans and chased the rerouted flame.

Mayor Gavin Newsom told The Associated Press that the well-choreographed switch of the site of the closing ceremony was prompted by the size and behavior of the crowds massing outside AT&T Park, where the opening ceremony took place.

There was “a disproportionate concentration of people in and around the start of the relay,” he said in a phone interview while traveling in a caravan that accompanied the torch.

International Olympic Committee President Jacques Rogge expressed relief that the San Francisco relay avoided the turmoil at previous events.

“Fortunately, the situation was better … in San Francisco,” Rogge said at an Olympic meeting in Beijing. “It was, however, not the joyous party that we had wished it to be.”

Less than an hour before the relay began, officials cut the original six-mile route nearly in half.

Then, at the opening ceremony, the first torchbearer took the flame from a lantern brought to the stage and held it aloft before running into a waterfront warehouse. A motorcycle escort departed, but the torchbearer was nowhere in sight.

Officials drove the Olympic torch about a mile inland and handed it off to two runners away from protesters and media, and they began jogging toward the Golden Gate Bridge, in the opposite direction of the crowds waiting for it. More confusion followed, with the torch convoy apparently stopped near the bridge before heading southward to the airport.

The plane carrying the torch took off from San Francisco International Airport at 11:05 p.m. CDT Thursday, said airport duty manager Abubaker Azam.

As the flame traveled toward the airport, news dribbled through the crowds of more than 10,000 spectators and protesters gathered at the waterfront that the torch wasn’t coming there.

Spectator Dave Dummer said he was disappointed.

“That upsets me,” Dummer said. “My back hurts from standing around on this lumpy sidewalk. … This was a once-in-a-lifetime opportunity and other people messed it up by protesting.”