In the 1980s and 1990s, Islamic militancy in pursuit of religious and political goals increased, many militants drawing inspiration from Iran's 1979 Islamic Revolution. In the 1990s, well-known violent acts that targeted civilians were the World Trade Center bombing by Islamic terrorists on February 26, 1993, the Sarin gas attack on the Tokyo subway by Aum Shinrikyo on March 20, 1995, and the bombing of Oklahoma City's Murrah Federal Building by Timothy McVeigh a month later that same year. This period also saw the rise of what is sometimes categorized as Single issue terrorism. If terrorism is the extension of domestic politics by other means, just as war is for diplomacy, then this represents the extension of pressure groups into violent action. Notable examples that grow in this period are Anti-abortion terrorism and Environmental terrorism.