Nicknamed "Tchize", Welwitschia was elected to parliament in 2008 and joined the central committee of the ruling MPLA in 2016
Kamto, 65, was arrested in late January after months of peaceful opposition protests over the results of the October 2018 election
He made the announcement at a national "dialogue," launched by Biya, on resolving a crisis that has left thousands dead
The campaign aims to vaccinate around 825,000 children in 24 regions, over a period of nine days, the body said.
If traders close their store, they risk being punished by the authorities. But if they keep it open, they face the wrath of separatists
Biya also offered a "pardon" to any separatists who voluntarily lay down their arms
Bongo's state of health has been the subject of fierce speculation, as the Gabonese leader has only made a few appearances
The conflict has killed some 2,000 people and driven hundreds of thousands from their homes