"...They were victims of a new kind of telephone fraud that exploits a weakness in the way the 911 system handles calls from Internet-based phone services. The attacks - called "swatting" because armed police SWAT teams usually respond - are virtually unstoppable, and an Associated Press investigation found that budget-strapped 911 centers are essentially defenseless without an overhaul of their computer systems..."
http://tech.yahoo.com/news/ap/200902...ec911_swatting