A more useful answer to the question might reference religious fundamentalism in the first world United States, as practiced by some extremely orthodox Christians who carry out terrorist attacks against the federal government or against medical clinics that provide pregnancy-termination services for women (i.e., conduct abortions). Timothy McVeigh, a young Army veteran who was convicted of bombing a federal building in Oklahoma City on April 19, 1995, killing 168 people, many of them children, and wounding another 680. As with many Christian extremists, McVeigh was convinced that the U.S. Government carried out anti-Christian policies and persecuted true-believers.
Another case involving an American Christian fundamentalist who carried out acts of terrorism was Eric Rudolph, who planted a bomb at the 1996 Atlanta Olympics and also bombed abortion clinics across the South. According to his own writings, Rudolph was motivated by religious fundamentalism and racism. He was a member of the Christian Identity movement that believes in the superiority of white Europeans over others, and he claimed to have carried out bombings against women's health clinics as a member of the Army of God.
In the cases of both McVeigh and Rudolph, there were accomplices to their crimes. In McVeigh's case, Terry Nichols was also convicted for his role in the bombing of the federal building in Oklahoma City. Rudolph's accomplices mainly helped him to evade capture by law enforcement for many years.
Religious fundamentalism in third world poor countries is wide-spread, as the economic conditions in those countries helps to foster extremism. One such country is Pakistan, a developing country with a great deal of poverty and with extremely serious problems with religious fundamentalism, both directed against the Pakistani Government, and against other religions within the country. Most of the religious violence in Pakistan involves the historical rift between Sunni and Shi'a Muslims, the roots of which emanates from an 8th Century disagreement over the identity of the rightful heir to the Prophet Mohammed.
Another poor country experiencing religious fundamentalism is Somalia, which has been without an effective government for two decades and has become a haven for Islamic extremists affiliated with al Qaeda.
It is probably best to start with a historical understanding of the term fundamentalism. It started in American during the modernist controversies in the church, which started in earnest during the 1920. During this time, there were a group of theologians that stated that the church must adhere to the "fundamentals" of the Christian faith. One of the most famous people during this time was Greshem Machen. Now fundamentalism is synonymous with anyone who is very conservative in his or her religious beliefs. In light of this, there are Islamic fundamentalists as well as Christian fundamentalists.
We also have examples of first world Christian fundamentalist in America. Think of Jerry Falwell and many fundamental churches and seminaries.