Mali's prime minister offers his resignation.
"At this moment of crisis, men and women who are worried about the future of our nation want a calm situation," he said in a televised address.
After being arrested by soldiers while trying to leave for France, it was unclear whether Cheick Modibo Diarra was forced to step down.
The African nation is already divided, with the north occupied by al Qaeda-linked militants following a March coup.
A spokesman for the soldiers who seized power in that coup and later handed it back to civilians in April said the prime minister had been arrested for not fully addressing Mali's problems.
He denied the arrest was a second coup, saying the president is still in place.
The streets of the capital were calm Tuesday following the announcement and there was no immediate comment from the president.
Diarra's resignation is likely to complicate international efforts to reunite the country through military intervention.
Mali PM quits after arrest (1:03)
Dec. 11 - Mali Prime Minister Cheick Modibo Diarra resigns after being arrested by soldiers, who deny his detention is a second coup. Lindsey Parietti reports. ( Transcript )