The U.S. Federal Bureau of Investigation has issued an alert warning that people with ties to terrorist groups are downloading images of U.S. stadiums from the Internet.
The intelligence bulletin was sent in recent days to law-enforcement agencies nationwide, but contained few details. FBI officials in St. Louis, Missouri say there is no specific threat, although the law enforcement agency has detected access to stadium related web sites.
Images downloaded from www.worldstadiums.com included the Edward Jones Dome, home to the National Football League's St. Louis Rams, and the RCA Dome, home of the NFL's Indianapolis Colts.
The FBI says it has contacted authorities in both locations about security precautions.