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President Idris Mahamat Déby orders the military to be on high alert and a "total closure" of the border.
Caf executive committee member Augustin Senghor says the decision to strip Senegal of the 2025 Afcon title is "unacceptable, abject and we have to denounce it".
It comes during the Nigerian president's state visit to the UK - the first by a west African leader in 37 years.
Residents of some areas have been without mains water for weeks.
The conflict has persisted despite a peace deal signed by DR Congo and Rwanda in December.
Aid groups and MPs have raised concerns over the move to prioritise defence spending over aid.
The return of southern white rhinos to the country comes after Ugandan poachers once wiped them out.
BBC Sport journalists and pundits look at what happened at the chaotic Afcon final, and what comes next.
Some 50,000 people are told to flee their homes as the army warns of a huge military offensive in Jonglei state.
Somalia became a key part of IS's global network after fighters were driven out of strongholds in Syria and Iraq.
They have engaged a lobbying firm with close ties to the US president to argue their case.
Rostam Aziz's purchase raises questions about continued journalistic independence in the region.
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