Top security brass of the Indian government is battling a "mysterious" threat from the Chinese side these days: tennis ball-sized UFOs.

Hundreds of unidentified flying objects (UFOs) have been sighted inside the Indian territory bordering China in recent months, raising security concerns. The issue, initially dubbed a minor one, has turned serious as India prepares to raise it at the diplomatic level with China.

Sources said a meeting of the boundary coordination mechanism - a highlevel official mechanism set up by the two sides to ensure that the boundary incidents between their armed forces do not escalate - is being scheduled later this month where the issue of "luminous objects" will be at the centre of the discussion.

The Indian delegation will be led by Gautam Bambawale, the head of the China desk in the external affairs ministry, while China will be represented by its director general, department of boundary and oceanic affairs. Security officials from both sides will also participate in the meeting.

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