WASHINGTON — U.S. counterterrorism officials say a key reason for raising the national terror alert on Tuesday had to do with the suspected activities of senior Al Qaeda (search) operatives thought to be in Iran (search) -- a country the Bush administration has long accused of harboring terrorists. "There's no question but that there have been and are today senior Al Qaeda leaders in Iran, and they are busy," Defense Secretary Donald H. Rumsfeld told reporters Wednesday. A surge in threatening communications, some given publicly, others intercepted covertly, was another critical factor, as were the recent attacks in Morocco...