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"It was the biggest fire I have ever responded to as a firefighter," remembers Jeff Carle, a division chief for the San Diego Fire Department. "That fire was not stoppable. At the stage that the fire was in when we arrived, there were problems in the adjacent occupied apartment complexes. Pine trees were starting to catch fire. Items on patios were starting to light up and catch fire. And we had to direct our activity towards saving life before we could do anything about the property."

Hundreds were roused from their beds and evacuated. Luckily, nobody – including firefighters – was injured. By the time the fire burned itself out the next morning, all that remained was a 12-foot-long banner that read: "If you build it, we will burn it." Also on the banner was the acronym: E-L-F.

When Carle saw the banner, he says he knew he had a problem.

A problem, because he knew what ELF stood for: the Earth Liberation Front, the most radical fringe of the environmental movement. It's the same group that set nine simultaneous fires across the Vail Mountain ski resort in 1998 to protest its expansion, causing $12 million in damage.

And it is the same group that has left SUV dealerships across America looking like scenes from Iraq's Sunni triangle, their way of protesting the gas-guzzling habits of American car buyers.

The ELF is a spin-off of another group called the ALF, or Animal Liberation Front, whose masked members have been known to videotape themselves breaking into research labs, where they destroy years of painstaking work and free captive animals. In recent years, they've capped off their visits by burning down the buildings. Still, they insist they are non-violent.

"For every arson that I've carried out, there's probably three or four that were not carried out for that fear of injuring somebody," says Rod Coronado, a former ALF leader, who is widely-credited with introducing arson to the cause.

He spent four years in prison for setting six fires, including one at Michigan State University.

Why burn down a building?

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