Smoke was seen rising from the presidential palace amid heavy gunfire in Niger's capital, Niamey, on Thursday in what one intelligence official said was a coup attempt.
Witnesses said machine gun and heavy weapons fire erupted in the city at around 1200 GMT and that soldiers were blocking roadways, including to the Prime Minister's office.
The Reuters witness later saw five injured soldiers at a hospital in Niamey amd a plume of smoke was seen rising from the presidential palace.
An intelligence officer, who asked not to be named, said the violence was a coup attempt that the presidential guard was trying to put down.
Police sources said they believed the attackers came from outside the city in armoured vehicles.
A member of Tandja's entourage in the palace said that "for now everything is alright".
By 1330 GMT the shooting continued but was less intense, the Reuters witness said.