"Arson is the leading cause of fire in the United States. Each year, an estimated 267,000 fires are attributed to arson, which result in $1.4 billion in property loss and cause over 2,000 injuries and 475 deaths. As a result, arson prevention and investigation have become the focus of increased attention within the federal government, the fire service, and the criminal justice system."
U.S. Fire Administration: http://www.usfa.dhs.gov/
Topical Fire Report Series (January 2001 (Rev. December 2001)), v.1 no.8