A Bucks teenager who built up a cache of terrorist manuals and guides for homemade firearms is facing jail.

Jacek Tchorzewski, 18, of High Wycombe, was caught with a range of documents for planning an attack when his electronics were seized on February 20 this year.

Among the PDFs found on his hard drive were the FM 5-31 Army Field Manual and Expedient Homemade Firearms Vol II.

He also had The Big Book Of Mischief, The Infection Cookbook and The Terrorist's Handbook.

He also had how-to guides for building his own weapons, including a "zip gun" - a firearm made from welded pipes.

Other guides in his possession contained instructions for a making a pistol out of sheet metal and a silencer made from a plastic bottle.

Tchorzewski appeared at the Old Bailey on Friday where he admitted 10 counts of possession of document containing information of use to a terrorist.

The court heard Tchorzewski is currently being assessed by doctors to determine whether he has Asperger's syndrome.

His legal team asked for his sentence to be adjourned to allow time for a pre-sentence report to be prepared.

Adjourning sentence until September 20, Judge Anuja Dhir warned him: "The offences you have pleaded guilty to are extremely serious and you should expect a custodial sentence."

Tchorzewski was remanded in custody until the next hearing.