Former TSA head warns of "failure of imagination" when predicting terrorists. Sept. 8, 2011 — -- While air travel security may look vastly different now than it did before the Sept. 11, 2001 ...

GUATEMALA CITY (AP) — Anti-kidnapping teams freed 11 guards overnight after they were held hostage by gang members for most of a day in two Guatemalan prisons, demanding that authorities move ...

ABC News will be airing a live special to mark the 20th anniversary of the September 11 attacks.