Was it a UFO or was it ice?

Cornisholme in Lincolnshire woke up sunday to a UFO scare after a wind turbine lost one blade and another was seriously damaged. Locals were said to have seen strange lights the night before and a large bang on sunday morning. If it was a collision then there is no debris and no reports of missing aircraft. A possible explanation is that ice built up on a blade and snapped off, or a chunk was flung from a neighbouring turbine. The UFO story is fun though ;)