the pursuit of a political aim by means of violence and intimidation. Modern terrorism emerged in 1968 with the hijacking of an Israeli El Al plane by Palestinians in Algeria. Terrorism has since become one of the most frequent and powerful means of waging war. In the 1980s, there was a total of almost 4,000 incidents worldwide, which was up by one-third from the 1970s. The number of deaths from terrorism doubled in that period. In the 1990s there has been a decrease in terrorist incidents worldwide. But also in that period, the danger from terrorism in the U.S. has increased, including the bombing of the World Trade Center, New York, in 1993. In 1995, the U.S. suffered the worst terrorist attack in its history, when 167 people were killed by a bomb placed by terrorists outside a federal building in Oklahoma City. Two anti-government Americans were convicted of the crime. In 1998, international terrorism flared up again, with bombings of U.S. embassies in Kenya and Tanzania, incidents which were quickly followed by U.S. attacks on terrorist targets in Sudan and Afghanistan.