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The heavy gunfire in Gao suggests that Mali's Islamist fighters have reentered the city.
Heavy gunfire has been reported in the city of Gao, a sign that Islamist militants have reentered the northern city after being driven out by French and Malian forces just weeks ago.
The gun battle comes just a day after a suicide bombing at a Gao checkpoint, the Associated Press reported, and two days after another suicide bomber attack within the city limits.
Security in the most populous city in Mali was increased following the explosions.
It is not yet clear which group is behind Sunday's gunfire, but the Movement for Oneness and Jihad (MUJAO) in West Africa claimed responsibility for the suicide attacks and threatened more violence, BBC News reported.
"We are dedicating ourselves to carrying out more attacks against France and its allies. We ask the local population to stay far away from military zones and avoid explosions," MUJAO spokesman Abou Walid Sahraoui said, the Daily Star reported.
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