Mali's ex-coup leader has been charged with "murders and assassinations", a judicial source has told the BBC.
Armed troops went to Amadou Sanogo's home to take him before a judge, after which he was remanded in custody.
He has twice ignored a summons issued in October by a judge to answer questions about events surrounding the March 2012 coup.
It plunged Mali into chaos, allowing Islamist militants to take over territory in the north.
The al-Qaeda-linked insurgents were ousted from the major towns in the north with the help of France and West African troops earlier this year.
The BBC's Alex Duval Smith in the capital, Bamako, says people seem relieved at the general's arrest, seeing it as a sign that the newly elected civilian government is finally showing its teeth to the military.
'Tears of joy'
Gen Sanogo, who was a middle-ranking officer when he led the coup, was taken away in handcuffs from his home by about 25 armed soldiers for questioning.
The former junta leader was also charged with kidnapping, a judicial source told the AFP news agency.
Gen Sanogo toppled President Amadou Toumani Toure, accusing him of not doing enough to combat a Tuareg-led rebellion in the north.
As well as prompting the Islamist insurgency, the coup also caused a rift between pro-junta soldiers, known as green berets, and those loyal to the former president, known as red berets.
Our reporter says that in the past few months the former coup leader had been elevated to general and moved to the former residence of President Toure.
This created an impression among Malians that he was being protected by the authorities, she says.
A collective of wives, widows and parents of 23 Malian red beret soldiers who disappeared in the month following the 2012 coup welcomed the news of the general's detention.
Their spokeswoman, Aminata Diarra, told the BBC: "For over a year we shed tears of sadness. Today they are tears of joy."