1.   Failed insulation on old wiring was the culprit, investigators finally concluded.

2.   Most of the costs, of course, lie in digging trenches or climbing poles to replace the old wiring.

3.   Old wiring could be the cause as well.

4.   The prison system that year built a new wooden chair, but kept the same old wiring.

5.   Their findings are still sending aftershocks through the aviation world as evidence mounts that old wiring is a widespread hazard in airliners.

6.   It was caused by sparks from old electrical wiring in the mine, a township government official told AFP Tuesday.

7.   The fire was caused by sparks from old electrical wiring in the mine, a township government official told AFP Tuesday.