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Airport police in India are being instructed to smile less.

This is over concerns cheerfulness could lead to a perception of lax security and a threat of terror attacks.

The country's Central Industrial Security Force, which is in charge of aviation safety, wants its staff to be "more vigilant than friendly".

They will move from a "broad smile system" to a "sufficient smile system", the Indian Express says.

Officials are said to believe that excessive friendliness puts airports at risk of terrorist attacks.

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The organisation's director general, Rajesh Ranjan even said the 9/11 attacks had taken place because of "an excessive reliance on passenger-friendly features".

This is not the first time Indian police officers have been told to improve their standards or alter their behaviour:

By contrast, elsewhere in Asia, Nepalese police hired 600 trainers in 2014 to help officers become more friendly.