The U.S. envoy to the United Nations says Rwanda remains politically “closed,” despite having experienced impressive growth since the 1994 genocide.

Ambassador Susan Rice spoke in the Rwandan capital, Kigali, on Wednesday at the start of her four-day diplomatic mission to the East African country.

The diplomat called Rwanda a “friend” to whom she can speak frankly. She said Rwanda has grown healthier, richer and more educated. But, she added, the nation is lagging politically.

The ambassador cited restrictions on the press, civil society activists, and political opponents of the government. Rice charged that some who have spoken out against the government have been intimidated or have simply disappeared.

Rwandan officials had no immediate reaction to Rice's comments.

Amnesty International has criticized Rwanda for what it called a clampdown on free expression during last year's elections. Rwanda rejected that report as “inaccurate.”

The U.S. envoy touted Rwanda's progress in the economic, agricultural and health sectors and for its tough stance against corruption. She also praised the country's advancements in technology, the environment and women's rights.