According to a leaked intelligence report Al-Qaeda is planning to "shake the Roman throne" with an attack on "a par with Hiroshima and Nagasaki." The report indicates that the plan will have the help of supporters in Iran.
The document says that there is no evidence indicating a relationship between the Shiite Iranian leadership and Sunni Al-Qaeda but claims that Iranian leadership may be turning a blind eye to terrorist organisations within the country.
Some experts suggest that the boast may not refer to a nuclear attack. "It could be just a reference to a huge explosion. They have got to do something soon that is radical otherwise they start losing credibility," one counter-terrorist source said.