1.   The fire at the house was the result of a dropped cigarette.

2.   A dropped cigarette may have sparked the fire.

3.   Two minor fires were probably caused by dropped cigarettes, officials on the scene said.

4.   The tragedy may have been sparked by a dropped cigarette or an electrical appliance that had not been switched off, firemen said.

5.   The tragedy may have been sparked by a dropped cigarette, or an electrical appliance that had not been switched off, firemen said.