Some Oahu residents woke up Thursday morning to malfunctioning outdoor sirens normally used for emergencies, according to the Department of Emergency Management.
The malfunctioning sirens started going off at around 5:30 a.m.
The Department of Emergency Management said the malfunction was related to an improvement project to modernize the state's Outdoor Siren Warning System.
The project outfitted eight Oahu sirens with modems that allow for remote satellite activation.
The contractor involved with the project inadvertently activated sirens at Diamond Head, Kamiloiki, Makiki, McCully, Moanalua Valley, and Waimanalo. Protocols are being developed to prevent a recurrence.
"We apologize for any anxiety this early morning sounding caused for area residents," said Doug Mayne, Vice Director of Civil Defense.