Northern Mali was occupied by Islamist fighters, some with links to al Qaeda, for most of 2012. Although they were driven out by a French-led military operation, sporadic violence continues.
"Very early in the morning there was gunfire. Apparently it`s an attempt to take hostages. The police are there and are sealing off the area," the security source said.
Witnesses in the area said police had surrounded the hotel and were blocking roads leading into the neighborhood.
The U.S. Embassy tweeted that it was "aware of an ongoing active shooter operation at the Radisson Hotel," and instructed its citizens to stay indoors.
An Islamist group claimed responsibility for the death of five people last March in an attack on a restaurant in Bamako popular with foreigners.
Two attackers have taken 170 people hostage in a luxury hotel in the Malian capital Bamako on Friday, the group that runs the hotel said.
"The Rezidor hotel group, which manages the Radisson Blu hotel in Bamako, understands that a hostage-taking is under way at the site today," the group said in a statement quoted by the BBC.
"According to our information, two people are holding 140 clients and 30 employees".
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