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CHARLOTTE, N.C. -- A loud noise Sunday night in the Highland Creek area of Charlotte has some neighbors baffled.

Some say it sounded like a plane in distress, a fog horn, a boat coming in or the drag strip, says Trish Cayea in an email to NBCCharlotte. It was too loud to be coming from the drag strip.

Cayea and others say they heard the noise around 9:30 p.m. Sunday night. It lasted about 20 seconds. Charlotte-Mecklenburg Police, as well as a representative of the nearby Concord airport, said they did not know what caused it.

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