 Activists in the Kenyan capital Nairobi have placed empty coffins in front of riot police to draw attention to excessive use of force during protests. Rights groups say 39 people have been killed over the last two weeks. There have been calls in China for restrictions on the sale of hyper-realistic silicone face masks. In an increasing number of crimes, the perpetrators have used such masks to fool facial recognition scanners. That's the latest world news from the BBC.