From CNN.com:
A group cited by U.S. officials as a domestic terrorism threat claimed responsibility Friday for knocking down two radio station towers in Snohomish County, Washington.
Much of the tower system, owned by radio station KRKO, was "flattened like a pancake," the manager said.
The Earth Liberation Front (ELF) issued a statement saying opponents of the towers argue that "AM radio waves cause adverse health effects including a higher rate of cancer, harm to wildlife, and that the signals have been interfering with home phone and intercom lines."
"When all legal channels of opposition have been exhausted, concerned citizens have to take action into their own hands to protect life and the planet," Jason Crawford, a spokesman for the group, said in a news release.