The Honolulu Fire Department responded to a siren malfunction in Moanalua Thursday morning.
Officials say the alarm began to sound just before 4 a.m. from the top of Ala Mahamoe Street.
HFD dispatched an engine company to shut down the siren at around 4:30 a.m. and technicians from the Hawaii Emergency Management Agency will be investigating the cause of the malfunction.
The city says siren systems are out in the elements 24/7 and occasionally malfunctions like this do occur.
Outdoor warning sirens are only activated for testing on the first working day of the month at 11:45 a.m. or for actual emergencies. In either case, when sirens are activated important information is broadcast immediately over all television or radio stations via the Emergency Alert System, as well as social media.
Should you hear an outdoor warning siren sound and there is no emergency information being broadcast, it is probably a malfunction.
To report a malfunctioning siren during normal business hours, call the Department of Emergency Management at 808-723-8960. On weekends, evenings and holidays contact the Honolulu Police Department at 911.
The Department of Emergency Management apologizes for any inconvenience this may have caused residents.