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The firebombing of the Vail Ski Resort in Colorado in October 1998 is among the most devastating acts of eco-sabotage in U.S. history, federal officials say.

(Firefighter Mark Mobley)

A 40-year-old woman who gave herself up last year after a decade on the lam will offer a plea in U.S. District Court in Portland in October in connection with what the government calls the most extensive eco-terrorism case in U.S. history.

Rebecca Rubin

Rebecca J. Rubin is set to change her plea from not guilty to guilty on Oct. 10, according to court documents. Rubin, who was hiding out in Canada, walked up to a border crossing in Washington state last November and turned herself over to the FBI in a prearranged deal with her attorney.

In Oregon, she's charged with conspiracy to commit arson and arson against the Bureau of Land Management's Wild Horse Corrals near Burns in 1997 and attempted arson at the U.S. Forest Industries office building in Medford in 1998.

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She's also facing charges in connection with the 1998 arson attacks against the BLM Wild Horse Corrals in Wyoming, a similar facility in California and the Vail Ski Resort in Colorado.

The charges stem from an arson spree in five Western states between 1996 and 2001 that caused $40 million in damage. Rubin, a Canadian citizen and former wildlife researcher, was part of a group that called itself "the Family." Acting under the auspices of the Earth Liberation Front and the Animal Liberation Front, the groups cells committed 20 arsons, the government alleges.

Rubin, known by the group as "Kara," was first indicted in 2006. A year later, 10 her 12 co-defendants were sentenced in Eugene to prison terms ranging from about three to 13 years.

She and two others went into hiding. The FBI is still looking for Joseph Mahmoud Dibee, 45 of Seattle, who's thought to be in Syria, and Josephine Sunshine Overaker, born in 1971 or 1974, who might be in a Spanish-speaking country.

Rubin, in custody since her surrender, is housed in Multnomah County Detention Center in Portland.

-- Lynne Terry