Janet Napolitano Dec. 27 "So the system has worked really very, very smoothly over the course of the past several days"

AP: Homeland Security Secretary Janet Napolitano conceded Monday that the aviation security system failed when a young man on a watchlist with a U.S. visa in his pocket and a powerful explosive hidden on his body was allowed to board a fight from Amsterdam to Detroit.

The Obama administration has ordered investigations into the two areas of aviation security — how travelers are placed on watch lists and how passengers are screened — as critics questioned how the 23-year-old Nigerian man charged in the airliner attack was allowed to board the Dec. 25 flight.

A day after saying the system worked, Napolitano backtracked, saying her words had been taken out of context.