Officials said the incident was reported from the AIIMS station here when a CISF jawan on-duty noticed the man, identified as Vishal Negi, trying to hand over a book to a person from the partition that separates the general area of the station from the security hold area of the station.
The CISF jawan intercepted the man and checked the book in which a small knife was allegedly found concealed.
They said Negi told security personnel that he was trying to sneak in the knife in the book as it would not have been possible had he gone through the normal security check system.
The Delhi Metro security is already on a high alert following the subway blasts in St Petersburg in Russia yesterday that killed 14 people.
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