Last Updated: Friday, 29 June 2007, 22:21 GMT 23:21 UK
Q&A: Car bomb investigation
What was the intended target of the car bombers?
What do we know so far about the two bombs found in cars in central London?
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Have the police said anything more about the characteristics of the bombs?
The police have not told us how they were to be detonated - this is one of the key questions for explosives scientists to answer. The bombs could have been designed to work in one of three ways:
Delay fuse or timer
Remote detonation, such as via a mobile phone circuit
Detonation by hand from inside - a suicide bomber
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http://news.bbc.co.uk/1/hi/uk/6253802.stm