What we know
1 Twenty-three young Muslims are being questioned about an alleged plot to blow up passenger airliners flying between Britain and the United States. They are aged between 17 and 35 and come from east London, Birmingham and High Wycombe. Most were named by the Treasury when it froze their assets. None has been charged.
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and what we still don't know
1 The exact nature of the alleged plot, including which chemicals were being used and how they would be detonated. Security sources believe nine or 10 planes would have been blown up in three phases, each by a suicide bomber on board. Other reports place the number of targets at between five and 12. There has been speculation the planes could have been blown up above the UK or the US to cause extra carnage on the ground; alternatively, they could have been destroyed above the Atlantic to make it more difficult for investigators to establish what happened. The most likely scenario, however, is that the bombers would have detonated their devices at roughly the same time regardless of their location. Police have said "items of interest" have been discovered in, or near, the suspects' homes. They have variously been reported to be martyrdom videos, a trigger device and bottles.
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4 What happened on Wednesday to accelerate the raids? Initially it appeared the alleged co-conspirators were believed to be about to board their target planes. But we now know that the arrest of Mr Rauf in Pakistan led the police to carry out the dawn arrests hours later for fear his detention could force the cell to take premature action. What is not clear is why he was arrested; it may have been a mistake by the Pakistani security services or he could have been picked up for a criminal arrest. Either way his arrest caused a crisis for the British police.
5 The extent of Tony Blair's knowledge. Downing Street had said Mr Blair did not know the raids would be launched on Wednesday night, so felt safe to fly to Barbados the day before. Why then did he believe the surveillance operation was sufficiently significant to brief George Bush about it the previous Sunday? And why have we barely seen John Prescott, who is meant to be charge of the Government in Mr Blair's absence?
http://news.independent.co.uk/uk/crime/article1219033.ece