Guam retested all-hazards alert sirens this afternoon

Guam Homeland Security said it retested the island’s All Hazards Alert Warning System sirens at 3:45 p.m. on April 7, 2026.

The same-day notice said residents near the siren sites could hear the alert tone and prerecorded voice messaging during the routine test. Government pages described the work as part of regular warning-system maintenance.

The notice was posted earlier in the day, at 6:00 a.m. UTC, and was tied to the afternoon Guam time retest. Officials did not say the test was connected to any emergency.

Guam has regularly issued public notices for siren testing in the past, and the day’s alert followed that pattern. No problems with the system were reported in the source material reviewed.

The retest is a routine public-safety check, but it remains one that nearby residents were likely to notice because of the audible alert and voice announcement.