India's foreign ministry has expressed concern after another of its diplomats was reportedly subjected to a security search at a US airport.
It has emerged that India's UN envoy, Hardeep Puri, was reportedly asked to remove his turban at an airport in Houston, Texas, two weeks ago.
When the Sikh refused to do so, he was detained in a "holding room", say Indian media.
India's US ambassador Meera Shankar was frisked at a US airport this month.
Foreign Minister SM Krishna told the media in Delhi on Monday: 'We have taken it up with the US authorities and the matter [involving Mr Puri] is at that stage".
The BBC's Jyotsna Singh in Delhi says Sikh men are expected to keep all hair intact and their heads covered in public.
The turban symbolises self-respect, honour, and piety. Touching of the head dress in public is not allowed.
Normally the turban is only removed in the most intimate of circumstances, when washing the face or hair.
There was uproar in India after Ms Shankar was subjected to a hands-on search at an airport in Mississippi, even after her diplomatic status had been revealed. BBC News
