Mr Nagy, the Under Secretary of State for the Bureau of African Affairs, who is on his third African tour, offered “heartfelt condolences to all those impacted” by the tragic plane crash in Ethiopia on Sunday.
He said the United States was “in contact with the Ethiopian government and Ethiopian Airlines to offer all possible assistance”.
The crash of the American manufactured plane, the Boeing 737 MAX 8, left 157 people dead.
Dubbed the killer plane, it was the second time since October last year that the Boeing 737 MAX 8 crashed shortly after take off, killing everyone on board.
It was not clear what caused the plane to go down just 8 minutes after take off, but it was reminiscent of a similar accident in Indonesia in October, when a Boeing 737 MAX 8 aircraft crashed 13 minutes after take off, killing 189 people on board.
Already, China and Ethiopia have grounded all Boeing 737 MAX 8 planes, citing safety concerns.
Boeing, the plane manufacturer, has not responded to the growing unease about one of its latest plane types which has fallen off the skies twice, killing almost 500 people.
Meanwhile, Mr Nagy has met with President Paul Kagame of Rwanda. On his second African tour, Secretary Nagy is visiting Rwanda, the Democratic Republic of Congo, Cameroon, Uganda, and former colonial country France.