The immigration officer has been identified by investigators after checking the CCTV footage of the immigration area in IGI airport here, a Home Ministry official said.
Monika Khangembam had alleged that on Saturday an immigration official at Delhi's Indira Gandhi International Airport hurled racist remarks at her when she was on her way to Seoul for a conference.
"The officer is being questioned about his behaviour and on the woman's complaints," the official said.
On her Facebook wall, Khangembam wrote that when she went to the immigration desk at IGI at around 9 pm on Saturday, an official looked at her passport and said, "Indian toh nahi lagti ho" (you don't look Indian).
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He then allegedly smirked at her and asked her how many states comprised the country, in an apparent bid to "know her Indianness".
When Khangembam told him she hailed from Manipur, the officer allegedly asked her to name the states Manipur shares its border with.
"I said I was really getting late and he goes like, 'aircraft aapko chodke kahi nahi jaa rahi. Aaram se jawab do'" (the aircraft isn't leaving without you. You can answer at ease).
After learning about the matter, External Affairs Minister Sushma Swaraj had expressed regret over the incident and said she would take up the issue with Home Minister Rajnath Singh.
The Home Ministry official said the Bureau of Immigration is expected to launch a sensitisation programme for immigration officials handling travellers in airports across the country.