The men, arrested in raids Dec. 20, are between 19 and 28, the BBC reported. Three are from Cardiff, Wales, two from London and four from Stoke-on-Trent. Three others arrested were freed.
The suspects are accused of conspiring between Oct. 1 and Nov. 20 to cause an explosion, and of engaging in conduct in preparation for acts of terrorism from Oct. 1 until their arrest. Prosecutors say they cased potential targets and researched and tested explosives.
Mohammed Moksudur Rahman Chowdhury, 20, and Shah Mohammed Lutfar Rahman, 28, both of London, have been remanded in custody until Jan. 14.
Gurukanth Desai, 28, Omar Sharif Latif, 26, and Abdul Malik Miah, 24, all from Cardiff, must appear at the Old Bailey on the same date.
Nazam Hussain, 25, Usman Khan, 19, Mohibur Rahman, 26, and Abul Bosher Mohammed Shahjahan, 26, all from Stoke-on-Trent, also remain in custody.
Details of the alleged plot were outlined in court but not reported under British secrecy laws.