Maui County officials are trying to determine what caused emergency sirens to malfunction, setting off false alarms early this morning and Tuesday night.

Maui County officials say the false alarms went off at 12:37 a.m. Wednesday and 8:37 p.m.Tuesday in a Wailuku neighborhood.

Police spokesman Lt. Wayne Ibarra says many concerned residents have called 911, but a civil defense notification says there were no emergencies when the alarms went off. 

Officials say they are trying to determine what caused the sirens to malfunction. 

Tsunami waves last struck Hawaii in the aftermath of a devastating earthquake across the Pacific in Japan March 11.