Federal authorities strongly suspect that the Earth Liberation Front is responsible for a series of fires that have destroyed four multi-million dollar show homes in a suburb north of Seattle, sources told ABC News. Officials said the fires are being investigated as acts of domestic terror, but they cautioned that it's too early in the investigation to make any solid determinations. The blazes began before dawn Monday and were still smoldering by late morning. The homes were unoccupied and no injuries have been reported, officials said. The fires are suspicious because they began at multiple locations in several houses, Snohomish County district seven Fire Chief Rick Eastman told the Associated Press.