Just not big, flashy, organized multi-person ones. It depends on how you define these crimes. Interesting article in the SF Chron:
The Myth Of The Lone Gunman
Cinnamon Stillwell
Wednesday, August 9, 2006
Since the attacks of Sept. 11, 2001, the claim has often been made that no further acts of terrorism have occurred on U.S. soil. But anyone following the news closely knows better. While there has not yet been another large-scale attack, a number of terrorist plots have been broken up and a variety of suspicious crimes and incidents have occurred across the nation. But each time, authorities seem to have made every effort to downplay the terrorism angle. News of the shooting rampage at Seattle's Jewish Federation building last month involved the usual avoidance of the term "terrorism." Instead, the attack was labeled a hate crime and the perpetrator, Naveed Afzal Haq, just another in a long line of lone gunmen with a history of mental instability. As Seattle Mayor Greg Nickels put it, "This was a purposeful, hateful act, as far as we know by an individual acting on his own." While this may be true, trying to separate Haq's actions from the larger context of the war on terrorism is tunnel vision at its worst. It is not just hate that motivates such acts, but ideology. One needn't be a bona fide member of an Islamic terrorist group to share their outlook.
snip:
Officialdom in Denial
This was the hardly the first time that a Muslim seemingly unconnected to organized terrorist groups nevertheless acted out their agenda. Middle East scholar Daniel Pipes even came up with a term to describe this phenomenon: Sudden Jihad Syndrome.Pipes and other scholars, such as Robert Spencer, have been tracking these cases for years. It is not certain that Islamist ideology was the motivation in each instance. But strangely enough, authorities almost always dismissed the possibility from the onset. Either that or they jumped on the "no possible known motive" bandwagon. The following examples bear this pattern out:
March 2006: Mohammad Taheri-azar plowed into a group of students at the University of North Carolina with his SUV. Afterward, he surrendered to authorities with a 911 call, telling them that he was trying to "punish the government of the United States for
actions around the world." Meanwhile, in a letter to the police, Taheri-azar spoke of exercising "the right of violent retaliation that Allah" had given him. Nonetheless, local officials and university officials immediately ruled out terrorism, leading several student groups to hold an "anti-terrorism" rally in protest.
September 2005: University of Oklahoma engineering student Joel Henry Hinrichs III blew himself up outside a packed stadium in what was dubbed a suicide. But it was more likely a botched suicide bombing. Beyond incriminating evidence found in his apartment, Hinrichs had connections to a local mosque and appears to have been a convert to Islam. Nonetheless, university officials and authorities studiously avoided the term "terrorism" and instead focused on Hinrichs' alleged history of personal problems.
snip:
Similarly, at a certain point, authorities will need to take the blinders off and start acknowledging that lone gunmen and Islamic terrorism are not mutually exclusive. As President Bush has repeatedly emphasized, "this is a different kind of war" and therefore a different kind of thinking is needed in order to win it. Unfortunately, it is our own officials who most seem to need an update.
Full article (with more examples):
http://www.sfgate.com/cgi-bin/article.cgi?f=/g/a/2006/08/09/cstillwell.DTL