The state of emergency gives the security services greater powers and puts restrictions on public gatherings
The fighting was between the government-allied militia group GATIA and the Coordination of Azawad Movements
The Malian government said the attackers would be hunted down and punished, and that the military had control of Nampala
Attacks are now becoming more frequent further south, in the country's centre, close to its borders with Burkina Faso and Niger
The arrest follows that of Souleymane Keita, described as the top jihadist leader in southern Mali, in March
The man, identified as Fawaz Ould Ahmeida, was a main planner of the November 20 attack on the Radisson Blu hotel that left 20 dead