A report by the International Atomic Energy Agency (IAEA) says that much of the work that Tehran has been doing as part of its controversial nuclear programme could only be for the purpose of building a nuclear bomb. World reaction to the report has been mixed. The United States is calling for the world to respond with sanctions against Iran. Israel, who just last week had tested a scud missile capable of reaching Iran, is calling for action. Al Jazeera's Patty Culhane reports from Washington.