Mr Khamenei emerged following the assassination of his father, Ayatollah Ali Khamenei.
The government also directed Americans to avoid travelling to Mali at the moment.
Ms Singh said the U.S. had different lines of communications at all levels of government with Niger.
Beryl Howell said the transparency activist did not adequately justify his request for an urgent hearing on his motion for expedited release of the Nigerian leader’s files.
At least 185 people have been killed and 1,800 injured in the fighting, UN mediator Volker Perthes said on Monday.
In a statement on Tuesday, the U.S. military said it was concerned by the allegations against the Nigerian military over the alleged killing and inhuman act.
