It’s possible that mistakes were made during last week’s arrest of prominent investigative reporter Ivan Golunov on large-scale drug trafficking charges, the Kremlin has said.

Anti-corruption journalist Golunov was detained and formally charged in a case that has drawn international attention to Russia’s media climate. The Interior Ministry on Friday published nine photos that it described as showing narcotic substances and scales found in Golunov’s apartment, which it later deleted after acknowledging that eight of the photos were taken at a different apartment.