The United States has expressed concern about instability in Turkey, US Secretary of State Marco Rubio said.

"We're watching the same news reports about what's going on that everyone else is watching. We're certainly concerned about these protests and some of the reports," Reuters quotes Rubio as saying.

According to Rubio, he expressed concern about the situation in Turkey directly during his meeting with Fidan.

Earlier, Reuters reported, citing a Turkish diplomatic source, that Rubio did not express concern about the protests and arrests of demonstrators in the republic during talks with Turkish Foreign Minister Hakan Fidan on Tuesday in Washington.