For the last five years, "television networks have been reluctant to show" the most disturbing images of Sept. 11, "but now, five years later, some of the restrictions are loosening," the AP says. For example, here's a CNBC memo about footage restrictions:

"Please note: For b-roll purposes in regards to 9-11 we have agreed we will not show the following:    -No planes flying into buildings    -No people jumping    -No collapse of the towers We can however show the towers burnings, smoke etc and all other aftermath."