Reports: One Of Brussels Bombers Arrested

Now 24 hours after the latest terrorist attack, in Brussels, at the airport and a subway station, killing over 30, wounding several dozen more. The latest details, precautions being taken, and what is currently known regarding how the attack was orchestrated, and who was responsible.

Was a vulnerability exploited, should more precautions have been taken beforehand, or was this simply an unavoidable, brazen, terrorist attack. ABC News Correspondent Tom Rivers joined us from London.