"It was a hoax call and we have tracked down the caller, who is a resident of Jyoti Nagar area. The motive behind the act hasn't been ascertained yet.
"The caller is being brought to the Parliament Street police station, where he will be questioned," DCP (New Delhi) Jatin Narwal said, adding that the caller may have to face legal action too.
The police did not reveal the caller's identity citing security concerns.
Several police teams, along with bomb disposal squads, were rushed near Parliament and it was at 6.12 PM that the fire department was alerted, following which fire tenders were rushed there too, said police and fire officials.
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The national capital is on a high alert and security was already stepped up following the terror attack at Pathankot and then inputs received by the police about the presence of two suspected Jaish-e-Mohammad key members here.
According to a senior police official, the caller is suspected to be mentally unstable.
He is believed to have told the police that he has been undergoing treatment at Institute of Human Behaviour and Allied Sciences (IHBAS) in north east Delhi, he said.