Homeland Security Briefing on U.K. Terror Arrests; DHS Secretary Michael Chertoff, Attorney General Alberto Gonzales, TSA's Kip Hawley

We'd like to provide you with the latest information we have on recent events in the United Kingdom and an update on the actions that we are taking to protect our citizens and to keep air travel safe and secure.

We want to be as open as possible with the public about the facts. At the same time, it's important, I'm sure you'll understand, that we preserve confidentiality of matters that are necessary in order to complete this investigation. And we also have to respect the demands of the British legal process, which puts certain restrictions on what can be said about ongoing cases.

As I think you're all aware, British authorities have arrested 21 individuals who are now in custody who are alleged to have engaged in a plot to detonate liquid explosives on board multiple commercial aircraft departing from the United Kingdom and bound for the United States.