centers in multiple states were knocked offline. experts say it exposes a national security vulnerability. here is tom costello. >> reporter: breaking this afternoon, honolulu police reporting a brief 911 outage in the city coming after more outages wednesday night on the mainland. >> you may have difficulty reaching us internally. we're having difficulty receiving 911 calls. >> reporter: 6:00 p.m. central time, multiple 911 centers cut off, in parts of four states. south dakota, nebraska, nevada, and texas. several call centers pushed out emergency alerts telling locals to use their cell phones or text for help. >> to our knowledge, we have never experienced an outage of this magnitude. >> reporter: service provider looma technologies blame three outages on a cut fire line due to a third-party company installing a light pole writing, we restored all services in approximately 2 1/2 hours. >> we're dealing with 911 and last-century technology. we're in the 21st century. we need to ensure that our 911 systems are current technology.

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