Man accused of spiking trees for radical environmental group BLOOMINGTON, Indiana (AP) -- An alleged member of a radical environmental group that has been connected to a series of arsons and other crimes has been arrested on charges of putting spikes in trees to destroy logging equipment. Frank B. Ambrose, 26, is accused of driving 10-inch spikes into trees last June in a section of the Morgan-Monroe State Forest slated for logging. Authorities believe Ambrose is affiliated with the Earth Liberation Front, a loosely knit group that claimed responsibility for spiking the trees. An ELF spokesman said that Ambrose is not a member. The ELF has claimed responsibility for at least 22 major crimes, including arson attacks and other acts of sabotage across the country. The FBI has attributed $37 million in damage since 1996 to the group. In a statement Thursday, Ambrose denied spiking the trees. After his arrest, he refused to answer questions, including whether he is affiliated with the ELF. Ambrose told The Herald-Times of Bloomington that he was targeted by authorities for publicly refusing to condemn the destroying of property to prevent harm to the environment. "Is it illegal to say that? It may not be popular with some people, but it doesn't mean I was involved in it," he said. A six-month investigation by state conservation officers and the FBI traced the spikes to Ambrose through store surveillance tapes, authorities said. According to court papers, Ambrose's car was spotted outside the forest at the time of the incident, and police found hammering and metal-cutting tools and cotton gloves with a residue similar to that from the spikes in Ambrose's apartment. Ambrose is the Midwest coordinator for the American Lands Alliance, a mainstream environmental group headed by former Indiana Rep. Jim Jontz. "American Lands doesn't support tree spiking," Jontz said from his Portland, Ore., office. "Of course, I hope that these allegations aren't true." Ambrose was released on $2,000 bail. Tree spiking in Indiana is punishable by up to three years in prison and a $10,000 fine. Leslie Pickering, an ELF spokesman, said Ambrose isn't a member. "It seems as though the authorities are having trouble coming up with suspects in relation to these crimes," Pickering said. "They seem to be taking to harassing public environmental activists like Frank and others in Portland and in New York City as well."