The FBI broke another terrorism case recently. http://www.usdoj.gov/opa/pr/2009/July/09-nsd-725.html (h/t Holger Awakens http://holgerawakens.blogspot.com/2009/07/seven-people-in-north-carolina-charged.html)
The case involved natural born citizens, naturalized citizens and a legal permanent resident. However, yet again, the Department of Homeland Security and Immigration and Customs Enforcement were missing in action. The FBI press release mentions only the assistance of their Joint Terrorism Task Force, and, interestingly, the North Carolina fusion center, NCISAAC, the North Carolina Information Sharing and Analysis Center. DHS and ICE are conspicuously abscent from the press release. http://charlotte.fbi.gov/dojpressrel/2009/ce072709.htm
Radical leftwing immigration attorneys claim as part of their opposition to the enforcement of immigration laws that ICE should ignore illegals and search for terrorists. http://www.ilw.com/immigdaily/digest/2009,0721.shtm They claim that ICE's primary responsibility is terrorism. Of course, it is not, as the FBI has primary jurisdiction over terrorism.
However, Janet Reno Napalitano seems to think that ICE is responsible for terrorism. And is especially concerned about domestic terrorism by Americans. http://www.washingtontimes.com/news/2009/apr/14/federal-agency-warns-of-radicals-on-right/
But the above case shows that Janet Reno Napalitano isn't really concerned about terrorism if it is performed by Muslims. The same woman who warned us about returning veterans, gun owners, and Christians, did not warn us about this group of Muslims and their ilk. http://www.washingtontimes.com/news/2009/apr/14/federal-agency-warns-of-radicals-on-right/ But in the above case, ICE had secondary jurisdiction, but did nothing in the investigation, or at least nothing enough to merit to have the FBI mention.