Jean Ping, the head of the African Union, on Friday criticised the coup leaders, saying he was following developments "with concern", while France called for dialogue to resolve the political crisis in its former colony.
The African Union, France, and ECOWAS, a West African economic bloc, have condemned a military coup in Niger, a day after dissident soldiers seized the president and dissolved the constitution.
"France calls on all players including the armed forces to find, through dialogue, and as soon as possible, a solution to the constitutional crisis," Bernard Valero, a French foreign ministry spokesman, told reporters.
Niamey, Niger's capital, was calm on Friday, with businesses and schools opening as usual, although armoured vehicles were seen stationed outside key government offices, including the presidential palace.
An Al Jazeera contact in Niger, who cannot be named due to security reasons, said life had returned to normal in Niamey with people resuming their daily activities.
"This morning we toured the city and found out that the military that took power have left their tanks and vehicles in some strategic points of the city," he said.
"This is normal following a coup d’état, in order to secure these areas."
New ruler
After carrying out the coup, soldiers calling themselves the Supreme Council for the Restoration of Democracy (CSRD), announced that Salou Djibo, their squadron leader, was the country's new ruler.
They said in a statement that Niger's current ministers would continue to run the government for the moment, and that they intended to turn Niger "an example of democracy and of good governance".
Niger at a glance Population of 15.3 million according to a 2009 estimate Declared independence from France in 1960 Official language French with several local languages also spoken Main religion Islam with Christian minority in south and traditional African religions also practised One of world's leading producers of uranium, accounting for about 7.5 per cent of world's supply Two-thirds of country is desert, with only fertile area along Niger River Sources: Reuters, CIA World Factbook
The statement also said that Mamadou Tandja, the ousted president, had been seen by a doctor and the 71-year-old was "doing very well".Tandja is reportedly being held in an army building in Niamey.
Soldiers stormed the presidential palace on Thursday, seizing Tandja and some of his aides after a four-hour gun battle. At least three people were reported to have been killed in the gunfight.
Tensions had been high in Niger since President Tandja dissolved parliament last year and changed the constitution to extend his rule following a referendum - a move that drew widespread criticism at home and led to international sanctions.
Marie-Roger Biloa, founding editor of the Africa International magazine, said some sort of action had been expected.
"Nigeriens are very proud of their democratic process," she told Al Jazeera from Paris, where she is based.
"They [Nigeriens] have been really trying to put a democratic institution in place, and everybody was expecting something to happen after President Tandja decided not to play by the rules."
Last June, Tandja dissolved the constitutional court that had ruled against him and assumed the power to rule by decree, brushing aside international criticism of the move, saying he was answerable only to the people of Niger.
He was supposed to step down in December following two five-year terms in a row, but his so-called reforms removed most checks on his authority, abolished term limits and gave him an initial three more years in power without an election, an extension he said he needed to complete large-scale investment projects.
Datei:Tandja in Nigeria June 2007.jpg|thumb|right|Foto von Tandja Mamadou von 2007.
Lage des Niger

 Am Donnerstag, dem 18. Februar, ist es in Niger zu einem Putsch gekommen. Eine Gruppe von Soldaten, die sich „Supreme Council for the Restoration of Democracy“ nennt, drang nach längeren Gefechten in der Hauptstadt Niamey in den Präsidentenpalast ein und nahm Staatschef Tandja Mamadou, der gerade eine Kabinettssitzung leitete, gefangen. In einer öffentlichen Erklärung der Putschisten wurde mitgeteilt, man habe beschlossen, alle Regierungsinstitutionen aufzulösen und die Verfassung außer Kraft zu setzen. Luftwaffenkommandeur Salou Djibo, der die Putschisten anführt, wurde zum Chef der neuen Militärregierung ernannt. 

Mamadou wird einer AFP-Meldung zufolge möglicherweise in einer Militärbaracke 20 Kilometer außerhalb der Hauptstadt festgehalten.

Sowohl die Afrikanische Union als auch die Westafrikanische Wirtschaftsgemeinschaft verurteilten den Staatsstreich. Frankreich, dessen frühere Kolonie Niger ist, forderte alle Seiten dazu auf, durch einen Dialog eine Lösung der Verfassungskrise zu suchen.

Dem Putsch war eine lange politische Krise vorausgegangen, die ihren Anfang im August 2009 nahm, als Tandja Mamadou ein Referendum über eine Verfassungsänderung durchsetzte, wodurch ihm eine dritte Amtszeit ermöglicht wurde. Zuvor hatte er das Parlament und das Verfassungsgericht aufgelöst, da sich beide Organe gegen das Referendum ausgesprochen hatten.

Tandja Mamadou ist seit 1999 Präsident des Landes, das als eines der ärmsten Länder der Erde gilt. Während seiner Amtszeit begann die Ausbeutung von Uran in dem Land. Die Uranmine gilt laut BBC als die weltweit zweitgrößte Abbaustelle des Schwermetalls.