A metal structure that mysteriously appeared on a roundabout in the Democratic Republic of Congo has been destroyed over fears about its origins. People in the capital, Kinshasa, stoned and torched the 12ft (3.7m) triangular prism that looked like other metal monoliths that have cropped up around the world over the last few months. It had begun to draw selfie-takers, which fuelled rumours on social media. Some feared it was satanic or put there by aliens or by a secret cabal.