Three Islamist militant groups have claimed the strike
13 foreigners were killed in the attack, including six Russians, three Chinese, two Belgians, an American and a Senegalese
"Tonight the death toll is heavy."
It was not clear whether any of the gunmen were still active.
Al-Mourabitoun was formed around two years ago and based in the Sahara Desert.
At least three were killed by the gunmen
Officials are probing "indications of a possible link" to the Nov. 13 Paris attacks
"Al Mourabitoun is a mixture of fundamentalists and bandits, who traffic weapons and drugs to finance themselves."
As many as 10 gunmen had stormed the building, firing shots and shouting "Allahu Akbar"