Michelle Malkin has lots of information and some good links on the story coming out of Lodi, California about the arrest of a possible father/son terror threat.
One does not wish to see a repeat of WWII internment camps filled this time with Muslims instead of Japanese, but we also have to face the grim reality that many Muslims in this country do not see themselves as Americans. Nor do they want to be Americans. Many of them feel a solidarity with Islamist jihadis around the globe and see their situation here in the States as an opportunity to strike a blow for Allah against the infidels.
That being the case, it's hard to fault those who look upon Arabs and other Muslims in our midst with suspicion, PC abhorrence of "profiling" notwithstanding. We can only hope that law enforcement and the larger Arab/Muslim community are vigilant and able to preempt any act of terrorism which may be planned to take place on our soil.
If they're not, it will surely be difficult to dissuade enraged Americans from tragic and pointless reprisals against innocent Arabs.