The US is concerned about the health and safety of Niger’s elected president Mohamed Bazoum, who has spent more than two weeks under house arrest.
“We are greatly worried about his health and his personal safety and the personal safety of his family,” a state department spokesman said.
Earlier Mr Bazoum’s party said he and his family were being detained under “cruel” and “inhumane” conditions, Reuters reported.
Mr Bazoum was deposed on 26 July.
Since then, a military junta has ruled Niger while Mr Bazoum has been kept in the presidential palace. Members of the junta have made no comment about the ousted leader’s condition.