NBC News has the story about teenagers that hacked an X-box account in order to get an address for "Swatting"--falsely reporting a crime in order to prompt a SWAT team raid. In this case, the family believed that the SWAT team was actually a group of criminals carrying out a home invasion. The story notes:
Unfortunately, this dangerous hoax is not uncommon. In 2008, the FBI issued a warning about “swatting,” which it describes as “faking an emergency that draws a response from law enforcement — usually a SWAT team.”(Underline added). Nothing about the danger to the unfortunate resident from the police. If a SWAT team busts into someone's house with automatic weapons and bullet proof vests, I doubt they are in much danger from a resident trying to defend him- or herself. But any resident attempting to do so will undoubtedly be killed. (As will the family dog).
“Needless to say, these calls are dangerous to first responders and to the victims,” the FBI report reads. “The callers often tell tales of hostages about to be executed or bombs about to go off. The community is placed in danger as responders rush to the scene, taking them away from real emergencies. And the officers are placed in danger as unsuspecting residents may try to defend themselves.”