False Missile Warning in Hawaii Adds to Scrutiny of Emergency Alert System

An errant cellphone alert about an incoming ballistic missile set off a panic and prompted calls for major improvements to America’s approach to disaster notification.

WASHINGTON — A false alert sent to cellphones across Hawaii on Saturday warning of an incoming ballistic missile is calling attention to an emergency notification system that government officials at all levels say needs major improvements.The Federal Communications Commission said it was opening a “full investigation into what happened” when the Hawaii Emergency Management Agency sent the errant alert as a result of what Gov. David Y. Ige said was human error: a worker who “pushed the wrong b...