The incident took place around 7.40 AM when Pradeep Kumar, a native of Unnao district in Uttar Pradesh, walked into the Parliament premises through the visitor's gate on Talkatora Road without the required pass.
He went the first security layer and was stopped at the second.
"No visitor is allowed access to the premises without a valid pass. The man was stopped at the second security layer. He was detained for security reasons and his records were thoroughly checked," Joint Secretary for Parliament Security Ajay Anand told PTI.
Kumar carried an Aadhar card, with the help of which security agencies contacted his family for verification of details.
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Several records were checked and at the police station Kumar was jointly interrogated by security officials and intelligence sleuths till evening, the official said.
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Kumar was released later in the evening with the police saying he did not disclose anything suspicious during interrogation.