Parts of Kibera, a slum on the outskirts of the Kenyan capital which houses at least 400 000 people, are being destroyed as authorities seek to build a new road.
Residents told Reuters that the demolitions have caught them by surprise.
"Most of my things have been destroyed, including my TV. All my property is here and I don't know where to go with my children," one of the residents says.
Al Jazeera reports that the destroyed buildings include homes, schools, churches and clinics.
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Rights groups say a resettlement plan needs to be agreed on.
Construction of the new road started in 2016. It's meant to ease congestion in the capital Nairobi.