The incident took place on Saturday afternoon at around 1:30 PM at the airport when the diplomats were headed for Kathmandu in Nepal.
The three young diplomats had to wait for their immigration formalities to be completed as there was rush at the counter.
When an official, identified as Somveer, was attending to them, they accused him of being slow.
An altercation broke out following arguments between them during which one of them slapped the official while the two others roughed him up, police said.
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