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

Federal officials said then that the near ubiquity of mobile phones made them the most effective means for warning of hurricanes, terrorist threats and missing persons. Emergency alerts are still broadcast via TV, radio and air siren, according to the Federal Emergency Management Agency.

Arriving with distinct ringtones and vibrations, the wireless alerts resemble text messages when they pop up on cellphone screens, but they rely on different technology. All wireless carriers participate in the system, and Hawaii’s emergency agency is among hundreds of federal, state, local, tribal and territorial authorities with the power to use them, according to FEMA.

There are three types of wireless alerts: those issued by the president; those involving imminent threats to safety or life; and Amber Alerts for missing children. More than 30,000 alerts have been sent since the system’s introduction, according to the communications commission. In 2016, law enforcement officials in New York used the system to circulate a kind of digital wanted poster in hunting for a man wanted in bombings in Manhattan and New Jersey. The alerts are free; consumers can use their phone settings to opt out of getting all but those sent by the president.

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In 2016, law enforcement authorities in New York used a wireless alert as a kind of digital wanted poster in the hunt for a man suspected of bombings in Manhattan and New Jersey.

The system has come under growing scrutiny in recent months, with public safety officials complaining that it requires upgrades on several fronts. Critics say they are often sent too widely, sowing fear among people unlikely to be affected by the threat in question. There have also been calls for the alerts to be sent in languages other than English. The communications commission has approved some changes, but they will not take effect until next year.

Last month, officials from Harris County, Tex., met with

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