Since the early 1990's, the Earth Liberation Front has claimed responsibility for dozens of instances of politically inspired property damage, including the 1998 Vail firebombing that was considered the costliest act of eco-terrorism in the country, causing $12 million in damage. On Monday, March 3rd in Woodinville, Washington, arsonists set fire to three uninhabited but furnished luxury model homes, causing an estimated 7 million dollars of damage. A spray-painted banner at the scene mocked builder's claims that the mansions were environmentally friendly, and bore the letters ELF, the initials of the Earth Liberation Front, a decentralized collective of radical environmentalists. Erin Siegal reports.