(AP) — The United States on Thursday placed on its sanctions list a former Zimbabwean army general who commanded troops accused of killing six civilians after a disputed election a year ago.

The listing of Anselem Sanyatwe signals U.S. frustration over the lack of accountability in the Aug. 1, 2018 killings in the capital, Harare. There was no immediate response by Zimbabwe’s government to the U.S. announcement, which was likely to bring fresh anger from an administration that has pressed for the lifting of U.S. sanctions over past rights abuses.

Sanyatwe is the first to be sanctioned over the crackdown and the first Zimbabwean official listed since the fall of longtime leader Robert Mugabe in November 2017. Sanyatwe and his wife are now barred from traveling to the U.S.

Soldiers were deployed to suppress a protest against delays in announcing results of Zimbabwe’s first election without Mugabe on the ballot. The U.S. statement says it has “credible information” that Sanyatwe was involved.

The election had been peaceful, giving many people hope that the southern African nation was on the brink of change. Zimbabwean President Emmerson Mnangagwa, who took over after Mugabe’s forced resignation and was declared the election winner, had promised sweeping post-Mugabe reforms and re-engagement with the West.

Sanyatwe later defended the soldiers’ deployment while appearing before a commission of inquiry into the killings, but denied the army shot the protesters and instead accused the opposition.

He later retired from the army and was appointed ambassador to Tanzania.