Other possibilities include an attack at transportation facilities, an attack against utilities or other public services or an incident involving chemical or biological agents. Terrorist incidents in this country have included bombings of the World Trade Center in New York City, the United States Capitol Building in Washington, D.C., Mobil Oil corporate headquarters in New York City and the bombing of the Alfred P. Murrah building in Oklahoma City. Biological and Chemical Weapons Biological agents are infectious microbes or toxins used to produce illness or death in people, animals or plants. Biological agents can be dispersed as aerosols or airborne particles. Terrorists may use biological agents to contaminate food or water because they are extremely difficult to detect.
Chemical agents kill or incapacitate people, destroy livestock or ravage crops.
Some chemical agents are odorless and tasteless and are difficult to detect. Biological and chemical weapons have been used primarily to terrorize an unprotected civilian population and not as a weapon of war. This is because of fear of retaliation and the likelihood that the agent would contaminate the battlefield for a long period of time. The Persian Gulf War in 1991 and other confrontations in the Middle East were causes for concern in the United States regarding the possibility of chemical or biological warfare. The effects of terrorism can vary significantly from loss of life and injuries to property damage and disruptions in services such as electricity, water supply, public transportation and communications.