The 91-year-old African president who keeps defying obituary-writers

Speculation over the wellbeing and whereabouts of Cameroon's 91-year-old President Paul Biya has become a hot topic across Africa this week.

After attending the China-Africa summit in Beijing in early September, it was perhaps no surprise that he gave the UN General Assembly in New York a miss.

But when he stayed away from this week's summit of French-speaking countries (La Francophonie) at Viller Cotterêts, north of Paris, the rumour mill went into overdrive, as he had not been seen in public for about a month.

Cameroon's ambassador in France insisted that Biya was "in good health" and in Geneva - his habitual base when away from home.