One of two terrorist suspects facing a semi-secret trial in Britain has pleaded guilty to possessing a document entitled "bomb making."

Mounir Rarmoul-Bouhadjar entered the plea days before he was due to stand trial alongside co-accused Erol Incedal.

Incedal will now be tried alone on charges of preparing a terrorist act and possessing bomb-making instructions. Rarmoul-Bouhadjar will be sentenced once the trial is over.

The men, both 26, were arrested last year, and prosecutors sought to have their trial held in secret on national security grounds.

After a challenge from media organizations, a judge ruled that some sections should be held in public, including part of the prosecution's opening statement and the verdicts.

Some journalists will be allowed to attend proceedings, but not to report on them as they unfold.