These facts lay bare lapses on the part of the Central Industrial Security Force (CISF), that handles security of the metro premises, and the Delhi Metro Rail Corporation (DMRC) authorities.
Police sources said the CISF personnel posted near the exit gates of the Adarsh Nagar Metro Station at that point could have prevented 19-year-old Sunita from making an exit had they been alert.
"She wasn't carrying a token and while exiting, she could only get out on the fourth attempt. It is questionable as to why the CISF personnel at the gate didn't see this or alert somebody," a police source said.
Metro's customer care cubicles, manned by staff from outsourced agencies, are also located near the exit gates.
It has been learnt that police might be approaching the CISF to seek more clarity in the case.
The DMRC did not respond to queries on the matter.
Police have circulated her photographs in NCR towns such as Ghaziabad, Noida, Gurgaon to gain clues.
The Delhi Police's Twitter handle has also tweeted about her disappearance and asked people to share details about her.
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