WASHINGTON (CNN) -- The Department of Homeland Security has sent an advisory to the National Football League and local officials advising of a possible, uncorroborated bomb threat against some NFL stadiums.
The threat, posted on a Web site, alleges that dirty bombs could be used this weekend against seven stadiums -- in Miami, New York, Atlanta, Seattle, Houston, Oakland and Cleveland. The bombs were to be delivered by truck, the posting said.
DHS said the posting is not considered credible and the information was being shared only in an abundance of caution so that league officials and others could determine what steps they want to take.
Homeland Security officials said people should still go about their plans and not avoid stadiums.
Greg Aiello, a spokesman for the NFL, said the league was notified of the uncorroborated threat on Tuesday and that all the teams are aware of it.
"We have been given no reason by the government to believe there is a credible threat," Aiello said. "Our stadiums are very well protected through the comprehensive security procedures we have in place," including bag searches, pat-downs and secure facility perimeters.
A federal law enforcement official told CNN the FBI and DHS held meetings with representatives of seven teams. The official would not identify the seven teams.
The FBI had no immediate comment on the report.
