UNITED STATES (CBS) — Your electronic devices may alarm you today — but there’s a reason for that. A nationwide test of the federal emergency alert system will be broadcast at approximately 2:20 p.m.

Shortly before 6 p.m. Tuesday, phones across Los Angeles County lighted up with an emergency alert test, the latest example of challenges that government officials are experiencing with wireless ...

Ever wondered why your phone suddenly shows emergency alerts during storms, floods or earthquakes? Know how disaster warning ...