LONDON, Britain: An independent think tank the Policy Exchange said that agencies linked to the Saudi government have distributed extremist literature to mosques and Islamic centers in Britain.

"Saudi Arabia is the ideological source of much of this sectarianism - and must be held to account for it," the study said. "Islamic institutions in the U.K. must clean up their act."

The Policy Exchange report, "The Hijacking of British Islam: How Extremist Literature is Subverting Britain's Mosques," describes 80 books and pamphlets collected at nearly 100 Islamic institutions, including leading mosques, in 2006 and 2007.

Experts in Islamic studies analyzed the material, some of which was translated into English from Arabic or Urdu.

Some of the literature espoused the creation of a separate state for Muslims, governed by Sharia law, and urged individual Muslims "to feel an abhorrence" for Muslims considered to be practicing an insufficiently rigorous form of Islam.