These are not "foreign terrorists" - they are/were foreign-born Americans whose minds were corrupted at some point in the last ten years of their stay here. This is a domestic situation that spiraled out of control -- the FBI didn't think the older brother was a serious enough threat to put a clamp down on him. Eventually we'll find out that, in fact, there was no one abroad who gave these men instructions to pull of this dastardly plot.
Iran's oil exports to South Korea quadruple to 400,000 barrels a day after sanctions lift (Reuters)
from the article: The Saudi connection linking the Boston Marathon to September 11