Nine men are due to appear at the Old Bailey charged with plotting terror attacks on major London targets in the run-up to Christmas.
The suspects, aged between 19 and 28, and from Cardiff, London and Stoke-on-Trent, were held last month during a series of dawn raids by counter-terrorism officers.
The potential targets are understood to include the London Stock Exchange, the US Embassy and political and religious figures.
They are charged with conspiring to cause explosions likely to endanger life or damage property between November 6 and December 21, last year.
A further charge alleges they were preparing for acts of terrorism between the same dates.
This was said to be by agreeing potential targets, carrying out reconnaissance work ahead of possible attacks, attending a series of meetings, igniting and testing incendiary material and researching and discussing materials and methods.
The defendants from Cardiff are Gurukanth Desai, 28, of Albert Street, Omar Sharif Latif, 26, of Neville Street and Abdul Malik Miah, 24, of Ninian Park Road.
The defendants from London are Mohammed Moksudur Rahman Chowdhury, 20, of Stanliff House, Tower Hamlets and Shah Mohammed Lutfar Rahman, 28, of St Bernard’s Road, Newham, both east London.
The suspects from Stoke-on-Trent are Nazam Hussain, 25, of Grove Street, Usman Khan, 19, of Persia Walk, Mohibur Rahman, 26, of North Road and Abdul Bosher Mohammed Shahjahan, 26, of Burmarsh Walk.
They will all appear by prison videolink before Mr Justice Calvert-Smith.