James Joyner relates a Washington Post story on the discovery of remnants of suicide squads in Fallujah, Iraq. The most important point to me was
The evidence -- Islamic books, pamphlets, tapes and farewell letters in Arabic -- suggested that some of the men were not Iraqis from the area, but foreign Sunni Muslims who had traveled to this urban Sunni stronghold to fight and die in a holy war, both against the U.S. forces and the country's Shiite Muslim majority.
To be honest, though,
...so far they have not conclusively established that any of the insurgents were foreign infiltrators.
Not conclusively,
But the unearthing of the Islamic documents among the bomb-making materials Sunday, while two foreign journalists and an Arabic interpreter were present, suggested that at least some of the suicide squad members were not from Iraq.
I don't know how closely Iraq was linked to Islamic terrorism before we attacked last year. I agree with James, though, that it appears pretty clear that there's a strong linkage today.