Dozens of mines have exploded as they were being handed over by Tuareg rebels to the government of Niger.
One person was killed and 40 seriously injured when a man accidentally stepped on one of the mines, setting off a chain reaction, officials say.
Among the injured is the governor of the Zinder region where the arms handover was taking place.
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At least 17 dead in Niger clashes ... Tuareg rebel Niger Movement for Justice (MNJ) last week denied it would end their year-long fight.
The dead man was a government official who had been acting as an intermediary between the government and the rebels, the Associated Press news agency reported.
Greater autonomy
The MNJ says it is fighting for greater autonomy and for a larger share of uranium revenue.
MNJ leader Aghaly ag Alambo last week denied a media report his fighters would lay down their arms and participate in a peace process mediated by Libyan president Muammar Gaddafi.
Tuareg militants in Mali and Niger have been engaged in sporadic armed struggles for several decades.
But analysts are divided over whether the Tuareg revolts have been driven by genuine political grievances or efforts to defend control of drugs, arms and migrant-smuggling routes.
Tuaregs are a historically nomadic people living in the Sahara and Sahel regions of North Africa.
(BBC)
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