At least 34 soldiers were killed in the latest attack by Islamist groups, Niger's military leaders say.
The company is majority French-owned, while the junta wants more local control of Niger's mineral wealth.
President Hichilema says Zambia cannot mourn indefinitely as a row with his predecessor's family escalates.
Players will train in Dakar instead "in a sovereign and conducive setting", says the prime minister.
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