Urban Exploration Helps Terrorism, Counterterrorism Agency Warns

“Urban Explorers (UE) — hobbyists who seek illicit access to transportation and industrial facilities in urban areas — frequently post photographs, video footage, and diagrams on line [sic] that could be used by terrorists to remotely identify and surveil potential targets,” warns the nation’s premiere all-source center for counterterrorism analysis.

Spelunking through subway tunnels might alert terrorists to “electrical, ventilation or signal control rooms.” The vantage point of a rooftop provides a glimpse useful to the “disruption of communication systems.”