"The road to radicalization ran less through Yemen... than through the Islamic hothouse of London."

John Burns on Umar Farouk Abdulmutallab.

[O]fficials in Washington and London have said they are focusing on the possibility that his London years, including his possible contacts with radical Muslim groups in Britain, were decisive in turning him toward Islamic extremism.

That view, if confirmed, would offer a stark reaffirmation that Britain, the United States’ closest ally, continues to pose a major threat to American security. Critics in Britain and the United States say the British security forces, despite major increases in budgets and manpower in recent years, have not yet succeeded in adequately monitoring, much less restraining, the Islamic militancy that thrives in the vast network of mosques that serve the nation’s 1.5 million Muslims — and on university campuses across the country where nearly 100,000 of the 500,000 students are Muslims, including many, like Mr. Abdulmutallab, from overseas....

[O]ne focus for investigators has been his activities in University College London’s Islamic Society, which he joined soon after enrolling at the university, perhaps partly as a refuge from the persistent loneliness he described in teenage postings on Islamic Web sites before he arrived in Britain....

The society’s guest speakers have included radical imams, former Guantánamo Bay prisoners and a cast of mostly left-wing, anti-American British politicians and human rights advocates. In January 2007, with Mr. Abdulmutallab as president, the society sponsored a “War on Terror Week” at venues on the University College campus, which was harshly critical of American conduct in Iraq and Afghanistan....