Increasing numbers of English-language websites are spreading al-Qaida's message to Muslims in the West.

They translate writings and sermons once largely out of reach of English readers and often feature clerics like Anwar al-Awlaki, who exchanged dozens of e-mails with the Army psychiatrist accused of the Fort Hood shootings.

The U.S.-born al-Awlaki has been an inspiration to several militants arrested in the United States and Canada in recent years, with his web-based sermons often turning up on their computers.

"The point is you don't have to be an official part of al-Qaida to spread hatred and sectarian views," said Evan Kohlmann, a senior investigator for the New York-based NEFA Foundation, which tracks Islamic militants.

"If you look at the most influential documents in terms of homegrown terrorism cases, it's not training manuals on building bombs," Kohlmann said. "The most influential documents are the ones that are written by theological advisers, some of whom are not even official al-Qaida members."

Most of the radical Islamic sites are not run or directed by al-Qaida, but they provide a powerful tool for recruiting sympathizers to its cause of jihad, or holy war, against the United States, experts said.

The number of English-language sites sympathetic to al-Qaida has risen from about 30 seven years ago to more than 200 recently, according to NEFA.