"Each year between 1996 and 1998, an estimated 4,800 fires were reported at construction sites or complexes. These fires are responsible for approximately 30 injuries, 10 fatalities, and $35.2 million in property loss. This report addresses the causes and characteristics of these fires."
U.S. Fire Administration: http://www.usfa.dhs.gov/
Topical Fire Report Series (November 2001 (Rev. March 2002)), v.2 no.14