WILKINSBURG, Pa. (AP) -- Officials have been trying to find the person who has a key to shut of a fire alarm that has blared for over 12 hours at a Pittsburgh-area public housing complex.

Residents of the Wood Street building in Wilkinsburg 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, has continued for more than 12 hours.

Allegheny County Housing Authority officials tell WPXI-TV (http://bit.ly/NwdmKR ) they're trying to locate the person who can 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.

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Information from: WPXI-TV, http://www.wpxi.com