PORTLAND — Tre Arrow, a radical environmentalist who was once one of the FBI’s most-wanted fugitives, has announced on his Web site he has accepted a plea deal on federal arson and conspiracy charges.

Arrow had entered a not guilty plea. His attorney, Paul T. Loney, confirmed Wednesday that Arrow “is changing his plea” and a hearing date has been set for Tuesday.

The U.S. Attorney’s Office in Portland did not immediately return a call seeking comment.

Arrow, 34, who has legally changed his name from Michael Scarpitti, is charged in a 14-count federal indictment with helping to destroy concrete-mixing trucks in Portland in April 2001 and of firebombing logging trucks near Mount Hood in June 2001.

Arrow became a fugitive after he was indicted, and was arrested in British Columbia in March 2004 on local shoplifting charges. He was extradited to the United States in February.

He said on his Web site he accepted a plea deal because he didn’t want to take the risk of “spending the rest of my life in prison.”

He insisted that in accepting a plea agreement “I am in no way selling my soul just to receive a sweet deal from the prosecution. By this I mean I am not giving them any information about anyone or any thing which could lead to others being prosecuted.”

Arrow said he was offered “a deal I couldn’t refuse, which takes into account the time I served in Canada.”