The sky above an erupting volcano in Indonesia was illuminated electric purple by lightning bolts in these spectacular images. Mount Sinabung in Karo, North Sumatra, erupted last week, spewing hot ash 16,400ft into the sky and depositing the volcanic debris in nearby villages. The eruption, which was the first large one since August last year, was followed by lightning bolts striking overhead days later. NEW - Mount Sinabung erupts in ...