The Honolulu Police Department (HPD) activated emergency sirens mistakenly Wednesday evening that residents and visitors heard across O'ahu and even Maui.

HPD Chief Susan Ballard says the department was going through a training on how to active emergency siren, and 'unfortunately it was accidentally activated.'

As soon as the mistake was identified, HPD says they notified the media and the state.

Chief Ballard apologized and said they are looking at other equipment to ensure the same issue does not happen again.

Ballard was unsure of why the emergency sirens went off on Maui.