The Department of Homeland Security warned officials on Wednesday in seven U.S. cities about a dirty-bomb threat to National Football League stadiums but does not believe the threat is credible, officials said.
The threat, posted on Monday on an Internet site, said bombs containing radioactive material known as "dirty" bombs had been smuggled into the United States and would be used to attack professional football stadiums this Sunday, the department said.
"We are looking at this with strong skepticism. We have judged that there is not a credible threat here. There is no evidence or intelligence that there is a credible threat of such attacks," said Homeland Security spokesman Jarrod Agen.
"But out of an abundance of caution, we thought it necessary to notify federal, state, local and private sector partners," he added.
The seven cities were identified as Miami, New York, Atlanta, Seattle, Houston, Oakland, California, and Cleveland in a Homeland Security notice sent to federal, state, local and private security officials in those areas.
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