The International Olympic Committee has postponed its upcoming world sports congress as a gesture of respect for victims of this week's terrorist attacks in New York and Washington.
The IOC extended "sorrow and prayers" to the victims, their families and rescue workers. The Winter Olympics will remain in Salt Lake City, the IOC says, and it will thoroughly review its security operations following the terrorist attacks.
"We have always put security as the No. 1 priority," IOC president Jacques Rogge said.
The issue of security at the winter games will be discussed by ruling executive board during a meeting in Lausanne, next week, Rogge said.
The board will listen to "its American friends" with respect to reassessing or modifying security measures, Rogge said. However, he did not indicate which areas of security would be reviewed.
In the United States, meanwhile, the PGA Tour has postponed the American Express Championship in St Louis, which had been scheduled to kick off on Thursday, featuring Tiger Woods and other top golfers.
Earlier, major league baseball postponed its whole schedule of 15 games. The last time the entire schedule of baseball games was shelved was for D-day in 1944.
Several college football games have also been cancelled, and the NFL is still deciding on whether to play on Sunday.
Major League Soccer in the US delayed all four of Wednesday night's games.
The US Women's Cup doubleheader, with the US against Japan, and Germany vs. China was also called off.
swissinfo with agencies