An official with MINUSMA, a U.N. mission, spoke on condition of anonymity because he wasn't authorized to talk to the press. He reported that at least two people were killed and others were wounded by the toll is still unknown.
It is also believed that hostages were taken in Campement de Kangaba resort near Bamako on Sunday.
Nearby residents said they heard shots fired and saw smoke in the air.
"Security forces are in place. Campement Kangaba is blocked off and an operation is under way," said Baba Cisse, a spokesman for Mali's security ministry.
The U.S. State Department warned of "possible future attacks on Western diplomatic missions, other locations in Bamako that Westerners frequent."
Jihadist attacks have been ongoing for several years, with jihadists active in Mali's northern and central regions.
Just another aspect of the Ramadan Boomathon.