One evening a little over a fortnight ago, a mysterious illuminated object appeared without warning in the dark sky above the world's largest oil refinery in Jamnagar, Gujarat. It circled over the complex before disappearing just as suddenly as it had appeared.

Three days later, the object returned, this time a little after dawn. This time, the process cameras at the Reliance Industries Ltd refinery managed to take a few pictures of the object. It was bright and spherical.

RIL has reported the sightings to the government, along with the pictures. The Air Force, Navy and Coast Guard have been put on alert, and the defence ministry is beefing up security for the refinery, sources said.

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