One of the biggest charities in the UK struggles to grapple with workers engaged in sexual abuse of vulnerable people in some of the worlds most hard hit areas.
A spokesman for UN chief Antonio Guterres confirmed only that there was a "security incident", but gave no further details.
French President Emmanuel Macron has said military operations should keep focusing on the region bordering Mali, Niger and Burkina Faso in a summit with West African leaders.
Chad calls for international support to help Africa's beleaguered Sahel region as leaders of Burkina Faso, Mali, Mauritania, Niger, and France attend summit in Chadian capital N'Djamenaas to discuss future of their military operation.
The fighting took place on Friday and Saturday in Salamat province, after cattle belonging to one herder ruined a field. The herders attacked as the farmers were taking the animals into an enclosure.
The exchange of a first batch of prisoners, supervised by a joint military committee, took place in the southwestern village of al Shwayrif.
Officials in Chad say that cattle theft, sparked by the animals trampling farmers' fields, triggered the deadly violence.
An official said explosives that were fired from outside the city "landed on separate sites."
The blast occurred at Kalam in the Lake Chad region, which has been battered by attacks from militants crossing from neighbouring Nigeria.
There was no immediate claim of responsibility for the attack, though it comes not long after a splinter faction of Boko Haram warned civilians that they could be targeted if they helped humanitarian groups or the military.
Not everyone has access to computers and the internet to continue attending school from home.
Fighters from Daesh West Africa Province drove into remote Felo village in Gubio district in the early afternoon, shooting fleeing residents and running them over with their vehicles.
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