The U.S. State Department warned on Thursday that it had seen indications of Russian "influence" on recent unrest in Chile, where two weeks of protests and riots have rocked the administration of President Sebastian Pinera.

A senior State Department official said there were "clear indications" people were taking advantage of the unrest in Chile — prompted by inequality and rising living costs — and "skewing it through the use and abuse of social media, trolling."

"We have seen indications of Russian activity supporting this negative course of the debate," the official said.