CHRIS HANSEN REPORTS ON THE ALLEGED PLOT AND THE INVESTIGATION INTO WHAT AUTHORITIES SAY COULD HAVE BEEN THE WORST TERRORIST ATTACK SINCE SEPT. 11

Report to Air on Monday, Sept. 15 at 10 PM on "Dateline"

NEW YORK - Sept. 11, 2008 � A jury in Britain delivered a verdict this week in the case authorities say could have been one of the biggest terrorist attacks since Sept. 11. Three men were convicted of conspiracy to commit murder, but, the jury was deadlocked on the more specific charge - the alleged plot to blow up planes. The verdict surprised a lot of people and left many to question: What exactly were those men planning? And how close did they come to success?

Now, in an in-depth report, "Dateline's" Chris Hansen reports from the streets of London on the alleged plot, the men being accused of the crimes and the international investigation that stopped it. The hour-long broadcast, airing on Monday, Sept. 15 (10:00-11:00 PM/ET), includes interviews with senior government officials from the United States and Great Britain who reveal details about the investigation from the inside not previously reported, explores the potential threat to aviation and takes a unique look at one man who reveals how al Qaeda nearly recruited him, and who makes it his mission to stop others from being recruited by terrorist groups.

When asked if he thinks a British citizen or citizens will launch an attack on the United States from the UK, Andy Hayman, who was the top Scotland Yard official overseeing counterterrorism at the time, says to Hansen: "Well, this particular plot gives you an insight to that. If we've got one plot that's been hatched with that ingredient, and it's unsuccessful, I would assume that objective still remains in place."

David Corvo is the executive producer of "Dateline NBC."