The Internal Displacement Monitoring Centre say political turmoil and climate change-related disasters displace one person every second, with the Democratic Republic of Congo, Syria, Iraq and China the worst affected.
President Joseph Kabila's two consecutive terms in office ended on Monday after 15 years in power, but his refusal to step down has created chaos in the country.
Fears grow that recent violence could lead to armed conflict in the DRC, which is the world's largest coltan producer - a main mineral for mobile phone production.
The Human Rights Watch in Africa says at least 44 people were killed in protests against President Joseph Kabila, including 37 killed by security forces and six police officers killed by demonstrators.
Police fired tear gas at opposition leader and supporters over government allegations, resulting in his hospitalisation, outside the prosecutor's office in southern mining hub of Lubumbashi.
Attackers armed with machetes raided a village and hacked at least 16 civilians to death in the east of the Democratic Republic of Congo.
Congo's President names former Finance Minister Clement Mouamba as prime minister, bringing one-time opposition leader to head of government
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