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A suicide bomber in an explosives-laden vehicle attacked a camp in northern Mali on Wednesday, killing at least 33 people and wounding dozens of soldiers and former fighters now trying to stabilize the region.

While there was no immediate claim of responsibility, suspicion quickly fell on the Islamic extremist groups operating in the area which oppose the 2015 peace agreement that brought the parties together.

The attack marks a significant setback for efforts to achieve peace in the long-tumultuous region.

The morning blast hit the Joint Operational Mechanism base in the city of Gao, home to Malian soldiers and hundreds of former fighters who had signed the peace agreement with the government.

Dismembered bodies could still be seen two hours after the blast.

A local official gave a provisional death toll of 33, speaking on condition of anonymity as he was not authorized to speak to journalists.

Dr. Sadou Maiga at Gao's hospital told The Associated Press that all other hospital activities have ceased with dozens of wounded victims arriving.

"Some have died from their wounds, and others are in a very grave state," he said. "At this point, it's not the toll of dead and injured that interests me, it's saving who I can."

Witnesses said the car bearing explosives breached the camp at around 9 a.m., just as hundreds of fighters were gathering for a meeting.

The suicide bomber "succeeded in tricking soldiers' vigilance" and penetrated the camp, said an army spokesman, Col. Diarran Kone.

Wednesday's attack underscores the enormous challenges that remain in northern Mali four years after the French military led an intervention to drive the jihadists from power in the major towns across the north. The peace agreement has proved difficult to implement and unpopular with the forces wreaking havoc in the region.

The former fighters who signed the 2015 peace deal include ethnic Tuareg secular rebels who once fought the Malian military. Now they are supposed to be forming joint patrols in the area, though the program has yet to begin.

Mali has become the world's deadliest U.N. peacekeeping mission. Some 29 U.N. peacekeepers were killed last year in attacks blamed on jihadist armed groups, according to a Human Rights Watch report released Wednesday.

The report details how extremists are extending their reach further into central Mali, trying to implement their strict interpretation of Shariah law and pressuring families to give up their children as soldiers for the cause.

The report also denounces rising levels of banditry, a phenomenon victims say is fueled by the slow implementation of the 2015 peace accord.

Malian Security Minister Salif Traore declined to respond to the report's specifics but said he is well aware of security challenges throughout the region.

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Associated Press writers Baba Ahmed in Port-Gentil, Gabon and Krista Larson in Dakar, Senegal contributed to this report.