According to a senior police official, the incident took place at around 10 pm last night, Mar 27.
The man has been identified as Fazr Mohammed. He climbed the wall of the international airport from the side of emergency gate five but was picked up by CISF personnel.
This incident comes just hours after a 28-year-old man, who wanted to go to Dubai to earn his livelihood, was arrested after he illegally entered the domestic terminal of the IGI and reached the apron area to board an Air India aircraft.
Uday Raj Chauhan, a resident of Uttar Pradesh's Hardoi district, had climbed up a tree and jumped inside the technical area of the domestic terminal.
Officials said that he was trying to get inside one of the Air India aircraft and was nabbed by the security staff. Chauhan was also handed over to police.