Prescribed burning, fires set on purpose, is a common, if risky, method.
即是故意纵火，虽然涉及危险，却是常见的做法。
Besides, there are smokers who accidentally set fires.
此外，也有吸烟者不小心引起火灾。
Some (fires) were accidental, while others were set on purpose.
有些是意外，有些则是有人蓄意纵火。
Some (fires) were accidental, while others were set on purpose.
有些是意外，有些则是有人蓄意纵火。
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