I know you noted your source as "email," but do you have a url for the newspaper this ad was published in?
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ON THE NET...
http://news.google.com/news?hl=en&ned=us&q=%22kill+an+American%22&btnG=Search+News
Disregard the question in post no. 8.
Thanks to by A.A. Cunningham for providing this link:
http://www.nationalreview.com/comment/comment-ferrara092501.shtml
Guest comment on NRO
"What Is An American?
A primer."
By Peter Ferrara, an associate professor of law at the George Mason University School of Law.
September 25, 2001 9:20 a.m.
COMMENTARY SNIPPET: "You probably missed it in the rush of news last week, but there was actually a report that someone in Pakistan had published in a newspaper there an offer of a reward to anyone who killed an American, any American.
So I just thought I would write to let them know what an American is, so they would know when they found one."