Police suspect some of the victims were accused of witchcraft by others on the boat that had travelled from Senegal.
A photo of the 3,000-year-old bracelet has been sent to airports, seaports and border crossings to stop it being smuggled out of the country.
Kenya's Beatrice Chebet is aiming to become just the third woman to clinch a 5,000m-10,000m double at the World Athletics Championships.
The army says social media footage is misleading and denies Islamists have the Kayes region in a chokehold.
The 32-year-old footballer was in court accused of raping two women and sexually assaulting another.
Niger's army has failed to contain the jihadist insurgency, with dozens killed in recent attacks.
As the 50th independence anniversary approaches the country grapples with poverty and inequality.
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