A single spark can start a prairie fire.

星星之火，可以燎原。

《新英汉大辞典》

And lightning or downed power lines spark this prairie fire.

闪电或者是倒下的电缆线引起了这次燎原大火。

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The single spark that started the prairie fire suggests the answer.

引发燎原之火的火花暗示了答案。

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It is the fear of seeing isolated incidents turn into a prairie fire that guides China's handling of unrest.

ECONOMIST: The angry are getting organised

In 1974, together with her fellow Weather Underground terrorist colleagues, she published a book called Prairie Fire: The Politics of Revolutionary Anti-Imperialism.

CENTERFORSECURITYPOLICY: Terror training grounds

As the David Horowitz Freedom Center's Discoverthenetworks.org website makes clear, Prairie Fire was the Weather Underground's declaration of war against the United States.

CENTERFORSECURITYPOLICY: Terror training grounds