Francois Lounceny Fall, a former prime minister of Guinea, arrived in Equatorial Guinea over the weekend to meet Obiang and to "gather more information" on the putsch that Malabo said was mounted by foreign mercenaries on December 24.
"We are leaving here comforted by the assurances we have received from the President of the Republic, and I can say that the United Nations will continue to support Equatorial Guinea in its stabilisation efforts," Fall said yesterday in a speech broadcast on state television at the end of his visit.
The Equatorial Guinea government has said its troops shot dead one "mercenary" and "used gunfire to disperse" others in the forests along the border with Cameroon, without specifying how many fighters were involved or how long the clashes lasted.
Equatorial Guinea's main opposition party, Citizens for Innovation (CI), has said dozens of its activists were arrested in recent weeks following the alleged coup attempt.
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The information could not be confirmed by official sources, and state media did not report it.
Formerly a small Spanish colony, Equatorial Guinea has become one of sub-Sahara's biggest oil producers, but a large proportion of its 1.2 million population lives in poverty.
Obiang, 75, who seized power in 1979, has faced a string of coup attempts during nearly four decades in office.
Critics accuse him of brutal repression of opponents, electoral fraud and corruption.