The Red Cross tells the BBC there are major food and medical care problems in the war-torn region.
It is not known whether the seven electoral commission employees who died were deliberately targeted.
The military plane crashed short of the runway in the capital Abuja, after reporting engine failure.
The specialist insurance market has previously apologised for historical links to the slave trade.
Tanzania is one of the few countries in the world to not publish data on Covid-19 cases.
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