According to the Chronicle, it was one of our own:

http://sfgate.com/cgi-bin/article.cgi?f=/c/a/2007/08/28/BA2ARQRFI.DTL

"Paul Addis, 35, of San Francisco, was booked into the Pershing County Jail in Nevada on the arson charge and misdemeanor possession of fireworks, Sheriff Ron Skinner said."