WASHINGTON (CNN) -- Four people said to have acted on behalf of the Earth Liberation Front have been indicted on a charge of setting fire to an agriculture research building on the Michigan State University campus more than eight years ago, authorities announced Tuesday.

Three Detroit, Michigan, residents and a Cincinnati, Ohio, resident were named in conspiracy and arson counts for a fire at a campus facility that housed federally funded plant genetic research.

Officials said the December 31,1999, fire on the East Lansing campus caused more than $1 million in damage to facilities and the loss of research records.

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