http://www.cnn.com/2007/US/09/05/loose.nukes/index.html

WASHINGTON (CNN) -- Six nuclear warheads on cruise missiles were mistakenly carried on a flight from North Dakota to Louisiana last week, prompting a major investigation, military officials have confirmed.

The plane took the cruise missiles from Minot Air Force Base to Barksdale Air Force Base for decommissioning Thursday, the Air Force said.

"This is a major gaffe, and it's going to cause some heads to roll down the line," said Don Shepperd, a retired Air Force major general and military analyst for CNN.

Shepperd said the United States had agreed in a Cold War-era treaty not to fly nuclear weapons. "It appears that what happened was this treaty agreement was violated," he said. The warheads should have been removed from the missiles before they were attached to the B-52 bomber, according to military officials. Watch the report on the military's investigation.

The crew was unaware that the plane was carrying nuclear weapons, the officials said, speaking on condition of anonymity because of the extraordinary sensitivity and security surrounding the case.