Never heard of any wild fires in Africa in the news before. I have seen those in South America, the US and parts of Europe, but not Africa? This is surprising. If indeed it was a natural phenomenon, then something unusual is happening with our climate
My thoughts too. And I was thinking why OP did not include source of the information in the post.
It is also no more news about Australia, USA and Canada being prone to this nature of wildfire disasters, although some part of African countries had got similar experiences of the wildfire but are usually notable to be caused by human aided activities whereas, the fire intentionally set on the dry vegetations erupts and escalates turning to the disasterous hazards.
I have not really heard about lightening being the cause of the disaster in the known African sides that had experienced this wildfire. I am neither not saying it is impossible of the natural causes to happen. Natural occurrence can be unpredictable but mysterious too.