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.
The Libyan warlord has consistently upped the ante, but only has a losing hand to show for it.
An autopsy carried out on four of the dead prisoners revealed traces of a lethal substance that had caused heart attacks in some of the victims and severe asphyxiation in the others, Chad's chief prosecutor said.
The time to act in Africa is now, before the pandemic peaks on the continent.
We speak to a Turkish doctor who's done extensive aid work in Africa and he tells us how Covid-19 once again puts African bodies at risk of ethically wrong medical experiments conducted by the West.
Nigeria's military said attacks by militants from Boko Haram and a splinter group affiliated with Daesh had "necessitated the contiguous nations of the Lake Chad basin to jointly launch this massive onslaught."
A joint effort will be required to overcome the potential spread of the pandemic on the African continent.
"It's the first time we have lost so many men," President Idriss Deby Itno says, after visiting attack site in Lac province, which borders Niger and Nigeria.
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