A teenager and two other men were convicted Monday of possessing documents useful to terrorists. They are to be sentenced Tuesday.

The prosecution said the two older men had computer files promoting violent jihad, documents with practical information on making and using weapons and explosions, and one that urged assassinations.

A jury at Blackfriars Crown Court convicted Hammaad Munshi, 18, of having a guide to making napalm. He is the youngest person convicted of a terrorist offense in Britain, the Crown Prosecution Service said.

Aabid Khan and Sultan Muhammad, both 23, were convicted of possessing documents useful to terrorists.

A fourth man, Ahmed Sulieman, 30, was found innocent after explaining the files found belonged to somebody else.

Judge Timothy Pontius deferred sentencing until Tuesday, but said all three were likely to draw prison sentences.

Prosecutors said Khan had recruited Munshi, who was 16 at the time of his arrest.

Munshi is the grandson of Sheikh Yakub Munshi, president of the Islamic Research Institute of Great Britain at the Markazi Mosque in Dewsbury, northern England.

Prosecutors said Munshi wrote notes about martyrdom and hid them under his bed.

"One who is not taking part in the battle nor has the sheer intention to die is in the branch of hypocrisy," said one note.

Prosecutor said Khan had links with proscribed terrorist organizations Jaishe-Mohammed and Lashkar-e-Tayyaba, and helped radicalize jailed "wannabe suicide bomber" Mohammed Atif Siddique. Siddique was found guilty last year in a trial in Scotland of four terrorism offenses and also of causing a disturbance by telling fellow students he planned to become a suicide bomber.

Khan testified that his interest in violent jihad began at age 12.

"I felt upset and angry with the onslaught against innocent women and children in countries such as Russia," he testified.

"The Russian army massacred quite a lot of Muslims in Chechnya, they bombarded woman and children in the cities and they flattened most of the republic. It is still going on today."

Khan was convicted of three counts of possessing articles for a purpose connected with terrorism. He was cleared of a similar count.

Muhammad was found guilty of three similar charges and a charge of making a record of information likely to be useful in terrorism.

Munshi was convicted of making a record of use to terrorists.

Khan was arrested in 2006 after a four-month trip to Pakistan.

Prosecutor Simon Dennison said thousands of computer files on a hard-drive and some DVDs in Khan's suitcase demonstrated "deep commitment to and involvement in violent jihad by promoting it, inciting others to take part in it and arranging for himself and others to attend military training in Pakistan in preparation for going to fight and, inevitably, to kill."

He said the documents included practical information on making and using weapons, poisons and explosives.

One document urged "assassinating named personnel and foreign tourists, and freeing captured brothers from the enemy," Dennison said.

Muhammad had similar material, the prosecutor said.