Three teenagers have denied plotting terrorist attacks with pipe bombs and homemade explosives.
The youths, believed to be right-wing extremists, had partially-assembled weapons including pipe and petrol bombs and improvised explosive devices when they were arrested in February, the Old Bailey heard.
One of them is accused of possessing a haul that included air rifles, a crossbow, stab-proof vest and a banned terror manual, the Mujahideen Poisons Handbook.
He was also allegedly caught with a notebook setting out plans for launching attacks and building explosives.
One teenager appeared via video-link from Feltham Young Offender Institution.
His two co-defendants are both on bail.
The trio, all aged 17 and from Loughborough, spoke only to confirm their identities and enter pleas to the charges, which relate to a period between January 1 last year and March 7 this year.
Their alleged plot was uncovered after one of the youths was arrested in Granby Street, Loughborough, on an unrelated matter on February 13.
The youth held in custody denies possessing an article for a purpose connected with terrorism, possessing a document likely to be useful to a person committing or preparing an act of terrorism and possessing an article for a purpose connected with terrorism.
Another denies possessing an article for a purpose connected with terrorism.
The third denies doing an act with intent to cause an explosion and possessing an explosive substance with intent.
All three are due to return to court for a review hearing in August.
