Eight men have been charged in Britain with conspiracy to murder and other terrorism-related charges.
It comes two weeks after more than a dozen men were arrested in raids across Britain.
Their names were given as Dhiren Barot, 32, of Willesden, London; Omar Abdul Rehman, 20, of Bushey, Hertfordshire; Zia Ul Haq, 25, of Paddington, London; Abdul Aziz Jalil, 31, of Luton, Bedfordshire; Nadeem Tarmohammed, 26, of Willesden, London; Mohammed Naveed Bhatti, 24, of Harrow, Middlesex; Quaisar Shaffi, 25, of Willesden, London; and Junade Feroze, of Blackburn, Lancashire.
They are all charged with conspiring to murder other persons between January 2000 and 4 August this year.
A second charge alleges that between the same dates they plotted to use radioactive materials, toxic gases, chemicals and explosives.
Barot and Tarmohammed were also charged under the Terrorism Act in connection with an alleged plot to target financial institutions in the US.
They are alleged to have been in possession of a reconnaissance plan of the Prudential Building in New Jersey which, according to the charge, was likely to be useful to a person committing or preparing an act of terrorism.
Barot was further charged with having reconnaissance plans for the Stock Exchange and Citigroup in New York and the IMF in Washington.
Shaffi was also charged under the Terrorism Act with possessing an extract from the Terrorist's Handbook which contained information on preparing chemicals and explosives.
A ninth man, Matthew Philip Monks, 32, of Sudbury, London, was charged with possessing a weapon. Four others were either released or charged with offences not linked to terrorism.
Britain has said little about the men it arrested, but US officials have said they include at least one senior al-Qaeda figure.
