WILKINSBURG, Pa. (AP) — Officials Monday were looking for a key to shut of a fire alarm that has blared for over 12 hours at a Pittsburgh-area public housing complex.

Residents say the alarm went off about 6:30 p.m. Sunday when one resident burned some popcorn.

But the alarm, which features flashing strobe lights and a high-pitched screeching sound, continued for more than 12 hours.

Allegheny County Housing Authority officials were trying to locate the person with the key to shut off the alarm.

Residents say they’ve been robbed of a night’s sleep — but also of the peace of mind that they’d be alerted if a real fire occurred in the meantime.