They were not so sure about the more complex "Fat Man" plutonium bomb, so they tested it in the desert of Alamogordo, New Mexico, before dropping one on Nagasaki on Aug. 9.
Mr Brennan told CNN there were "indications" a radical US cleric of Yemeni origin had links both to the Nigerian charged with the bomb plot, and the man accused of November's shootings at a Texas military base.
BBC: France follows Britain and US in shutting Yemen embassy
Timothy McVeigh, the man who planted that bomb, had been infuriated by what happened to the Branch Davidians.
The material that went into Fat Man, the plutonium bomb detonated over Nagasaki, was made at Hanford, which at its peak consisted of nine nuclear reactors and five plutonium reprocessing plants.
Federal authorities have charged a Texas man with calling in a bomb threat to the center before last year's anniversary of the September 11 attacks.
Earlier, First Minister Peter Robinson said the arrest of the man convicted of the IRA Shankill bomb could have "grave consequences" for the political process.
The family of a man set on fire in a petrol bomb attack in Londonderry have said they fear he will not recover from his injuries.
The man whose home was targeted in a pipe bomb attack in Derry has spoken of his shock.
Meanwhile, a man who was arrested after the discovery of bomb-making equipment at Ballyfermot in southwest Dublin has been released without charge.
Nervousness among foreign residents of Saudi Arabia was heightened when a British man was killed on June 20th by a car bomb in Riyadh, the Saudi capital.
In 2011, a Danish court sentenced a Chechen-born man to 12 years in prison for preparing a letter bomb that exploded as he was assembling it in a Copenhagen hotel.
Malta was key to the Lockerbie trial, because it was there prosecutors said the bomb which exploded over the Scottish Borders was placed by the only man convicted of the crime, Abdelbaset al-Megrahi.
Easyjet confirmed a man was denied boarding due to a comment made about a bomb but he "had not been banned for life".
Mr Gauci picked out Megrahi as the man who bought clothes later found in the suitcase that contained the bomb.
When the Navy conducted its atomic bomb tests at the Bikini Atoll in 1946, more than 90 people volunteered to man the ships stationed in the target area, so that scientists could gather data about the biological effects of the blasts.
And a Maltese shopkeeper, Tony Gauci, was the only witness to identify Megrahi as the man who he said bought several items of clothing which were later found wrapped around the bomb which destroyed Pan-Am Flight 103.
应用推荐