Online threat - but SWAT raids wrong house
This seems to be a growing prank where someone hacks into someones network and places a 911 call through VoIP or makes threats.
Dunno if this will stop all of it but everyone should do it.
1. change password to your wireless router.
2. use WPA or better encryption
3. Turn off SSID broadcast after everything is setup correctly (people driving by searching for networks won't see yours)
4. Use MAC address filtering so only your devices get IP addresses from the router. (MAC addresses are unique to the device and we usually know what devices we want to connect to the internet ). This works for bother wired and wireless connections.
Wireless router also don't have to be expensive. Wireless 802.11N Router w/ WPS & WISP Function (300Mbps) | Wireless Routers / Wireless Access Points