"The matter (appearance of a mysterious illumination object) is being investigated by the local police and central security agencies, and it has been reported that the object could be a meteorological balloon or a 'Chinese sky lantern' etc," Minister of State for Home Mullappally Ramachandran told the Lok Sabha in a written reply.
He said various steps, including periodic audit, are carried out by central security agencies to ensure safety of important installations.
"Security agencies also carry out periodic security audit and make recommendations for strengthening security. Advisories, based on these recommendations and other inputs, are also issued from time to time to authorities concerned," Ramachandran said.