The incident was detected late last night at the IGIA when CISF officials detected suspicious activities of two ground handling staffers who were exiting the cargo terminal area at around 10:45 pm.
CISF spokesperson Hemendra Singh said over a dozen new phones of a domestic mobile phone maker and its accessories were found concealed "under the jackets" of these men and later on their sustained questioning two other people from the same firm were nabbed for their alleged involvement in the theft.
"The four personnel of Cambata Aviation staff were later handed over to IGIA police," Singh said.
Deputy Commissioner of Police (IGIA) D K Gupta confirmed that four employees of the said company have been arrested under various provisions of law.
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The investigators identified the four people as Nitin Yadav, R S Rawat, Sunil Yadav and Surendra Kumar.
They said a report of some mobile phone pieces missing from an incoming cargo flight from Hong Kong was also registered yesterday, few hours before the four men were held.
Police is now investigating the case further, they said.
The CISF, which guards the IGIA, has deployed a special scanner at the cargo and passenger terminals in order to check the menace of theft from baggages.