by Katie Valentine Posted on February 9, 2015 at 9:11 am Updated: February 9, 2015 at 3:03 pm

Tar sands activists in several states have been getting visits from the FBI, and no one knows yet exactly why.

Federal agents have been contacting activists who have participated in anti-Keystone XL and anti-tar sands protests, according to the Canadian Press. The visits have been happening to activists in Oregon, Washington state, and Idaho, and a lawyer working with the activists told the Canadian Press that he has advised them not to talk to the agents.

“It’s always the same line: ‘We’re not doing criminal investigations, you’re not accused of any crime. But we’re trying to learn more about the movement,’” he said.

Read the whole story here, on Think Progress.