Mysterious black smoke ring floats through the sky in China

Thick black smoke rises into the air from vehicle fire on Thai motorway

Planes pass through thick black smoke clouding flight path above burning homes

Black smoke plume rises from burning pick-up truck as fire spreads to wooden home

Black smoke billows next to airport sparking panic in China

Large plume of black smoke rises after explosion along highway in China

Bizarre black ring of smoke appears in sky after ship burns and sinks

Pickup truck belches out thick black smoke while waiting at traffic lights