Andrea Elliott of the New York Times has a good in-depth report on the disturbing number of Somali Muslim refugees living in Minnesota who have returned to Somalia to join the jihad: A Call to Jihad, Answered in America.

In November, Mr. Hassan and two other students dropped out of college and left for Somalia, the homeland they barely knew. Word soon spread that they had joined the Shabaab, a militant Islamist group aligned with Al Qaeda that is fighting to overthrow the fragile Somali government.

The students are among more than 20 young Americans who are the focus of what may be the most significant domestic terrorism investigation since Sept. 11. One of the men, Shirwa Ahmed, blew himself up in Somalia in October, becoming the first known American suicide bomber. The director of the Federal Bureau of Investigation, Robert M. Mueller, has said Mr. Ahmed was “radicalized in his hometown in Minnesota.”

An examination by The New York Times, based on interviews with close friends and relatives of the men, law enforcement officials and lawyers, as well as access to live phone calls and Facebook messages between the men and their friends in the United States, reveals how a far-flung jihadist movement found a foothold in America’s heartland.

The men appear to have been motivated by a complex mix of politics and faith, and their communications show how some are trying to recruit other young Americans to their cause.

The case represents the largest group of American citizens suspected of joining an extremist movement affiliated with Al Qaeda. Although friends say the men have never thought of carrying out attacks in the United States, F.B.I. officials worry that with their training, ideology and American passports, there is a real danger that they could.

“This case is unlike anything we have encountered,” said Ralph S. Boelter, the special agent in charge of the F.B.I.’s Minneapolis office, which is leading the investigation.

Read the whole thing…

UPDATE at 7/13/09 12:22:10 pm:

Here’s a report on the mosque some say played a part in radicalizing these young men: Sudden notoriety: Mosque in Minneapolis draws scrutiny from U.S. Senate, FBI and international media. (Hat tip: Soccer Dad.)