The investigation of Major Nidal Malik Hasan, the Army psychiatrist suspected of murdering 12 soldiers and wounding 30 others in last week's shooting rampage at Fort Hood in Texas, is uncovering evidence of a man deeply interested in the minority branch of Islam that views non-Muslims as dangerous infidels and endorses the use of violence to deter America from its wars in Afghanistan and Iraq and from support for Israel.

Medical colleagues in the Army have told reporters that he gave a presentation in which he warned in graphic detail of the torments waiting for nonbelievers in hell. Army investigators say there is no evidence yet that the actions he's accused of committing were carried out with anyone's assistance, but they have also zeroed in on his apparent email contact with miliant preacher Anwar al-Awlaki, who was born in New Mexico in 1971 and is now believed to be living in his parents' homeland of Yemen.

Mr. Awlaki is a leading light among militant Sunni preachers seeking to reach out to English-speaking Muslims and encourage them to engage in jihad in the West. He's at the forefront of the effort to create more "homegrown" jihadis, whose language skills and passports help them operate in the US and Europe.

Awlaki maintained a website presented in impeccable English until Tuesday, when its contents were deleted. The site had a an "Ask the Sheikh" button in which users could email him with questions. It devoted much of its contents to the glories of jihad. Awlaki even authored a treatise urging Muslims to violence called the "44 Ways to Support Jihad" which begins with a hadith, or story about the life of the Prophet Mohammed, that encapsulates his view of faith and conflict. "The Messenger of Allah says: ‘Whoever dies and has not fought or intended to fight has died on a branch of hypocrisy.' "

Awlaki's writings have been found on the computers of British, US, and Canadian terror suspects in recent years, among them the New Jersey men accused of plotting an attack against Fort Dix in 2007. US court documents have alleged that he used a US-based Islamic charity to send money to Al Qaeda. They also allege that he once asked American-born militant cleric Ali al-Timimi – who is now serving a life sentence for urging followers to fight the US in Afghanistan – to help him recruit fighters here.

On Monday, a post attributed to the preacher praised Hasan as "a hero. He is a man of conscience who could not bear living the contradiction of being a Muslim and serving in an army that is fighting against his own people."

Awlaki, who may have briefly served as a Muslim chaplain at George Washington University according to his now-defunct website and a 2001 article by National Geographic News, also lashed out at Muslims who condemned the murders, branding them as traitors and hypocrites. "The Muslim organizations in America came out in a pitiful chorus condemning Nidal’s operation. Nidal has killed soldiers who were about to be deployed to Iraq and Afghanistan in order to kill Muslims. The American Muslims who condemned his actions have committed treason against the Muslim Ummah and have fallen into hypocrisy."

Muslims in Awlaki's school, often referred to as salafis (a term that refers to the early followers of the prophet Mohammed), practice takfir, which brands fellow Muslims they disagree with as apostates deserving death.

ABC News cited unnamed US investigators as saying that the contacts with al-Awlaki were deemed benign and didn't involve direct calls to illegal action. "We don't have any indication that (Hasan) was directed, we don't have any indication that there were co-conspirators but, once again, this is fairly early on in what may be a complex and long-term investigation," a senior investigative official said.

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