The UN Security Council called Friday for an intervention plan to be drawn up within 45 days after passing a French resolution to revive attempts to end the crisis.
The renewed threat against French expatriates and hostages came ahead of a summit of Francophone nations in Congo, where French President Francois Hollande is expected to urge the formation of an African-led force to rout the Islamists.
Oumar Ould Hamaha, a spokesman for Islamists group MUJWA told Reuters, If he continues to throw oil on the fire, we will send him pictures of dead French hostages in coming days.
