The Associated Press MOSCOW (AP) — Colleagues of renowned investigative journalist Anna Politkovskaya marked the 10th anniversary of her killing Friday by urging the Russian government to track down the mastermind, while the U.S. State Department noted that the failure to do so has undermined freedom of speech in Russia.

Politkovskaya, who won international acclaim for her investigative reporting exposing human rights violations in Chechnya, was gunned down in the elevator of her Moscow apartment building on Oct. 7, 2006.

In 2014, a court in Moscow convicted the gunman and three other Chechens involved in the killing along with a former Moscow policeman who was their accomplice. Another former police officer involved in the killing made a deal with authorities that allowed him to qualify for a reduced sentence in exchange for cooperation with investigators.

Politkovskaya’s newspaper, Novaya Gazeta, on Friday strongly criticized the investigators for failing to determine who ordered the killing. It said that “official lies that the case has been solved cause fury.”Speech