Attention Treehuggers : Code Orange

According to the recently released Benchmark Analysis for Quantifying Urban Vulnerability to Terrorist Incidents, the City of Trees is at serious risk. "It surprised us too," said researcher Walter W. Piegorsch, a mathematics professor at the University of Arizona and co-author of the study.

Can you guess which landlocked metropolis of 200,000 people is in the top 10 among 132 urban centers, ranked by vulnerability based on a unique mathematical calculation?