A slogan on another boat read “commercial fishing equals rape,” and there was a smattering of obscenities.

Plymouth police are investigating, and police Capt. John Rogers said detectives would view surveillance video from the boatyard.

Barrett said the video shows two people spray painting the boats around 9 p.m. Sunday.

Barrett said the acronym “ELF” (Earth Liberation Front) was written on some of the vessels. The website Wikipedia says the organization engages in “economic sabotage and guerrilla warfare to stop the exploitation and destruction of the environment.”

An e-mail to the organization’s press office asking if it had any involvement in the Plymouth incident did not bring an immediate response. Rogers said he was aware that the initials were found on some of the boats, but he would not comment further.

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