From text alerts to a tornado siren, the city of Denver broadcasted three accidental emergency alerts in six months.

What happened Brazil suspended its mobile phone emergency alert system after a suspected cyberattack triggered false warnings on phones across several states. The incident occurred early Saturday when ...

Hackers breached Brazil’s emergency alert system and used the government’s civil defense platform to send millions of highest ...

The ShakeAlert computer system that warns about the imminent arrival of shaking from earthquakes sent out a false alarm Thursday morning for a magnitude 5.9 quake in Carson City, Nevada, that never ...

Confusion spread across Northern California on Thursday after thousands of residents received earthquake alerts warning them to “drop, cover and hold on.” But officials now confirm no earthquake ...

A series of phone alerts and updates have been issued to Dubai residents and visitors over recent days due to the ongoing ...