While Delhi Police moved the Patiala House Court, seeking a 15-day remand for the four accused persons in the security breach case, the latter granted a remand of 7 days to the Special Cell.

Four persons arrested in connection with the security breach in Parliament have been charged under the anti-terror law UAPA besides sections of the Indian Penal Code, police sources said on Thursday as security agencies were on the hunt to nab the alleged mastermind.

During interrogation, it was revealed by the accused that they wanted to enact revolutionary Bhagat Singh's action of throwing bombs inside the Central Assembly during British rule in India, the sources said.

Police said the accused had planned to throw pamphlets in Parliament after using the smoke bombs, adding that they had also bought tricolours.

The case was registered against the four -- Sagar Sharma (26), Manoranjan D (34), Amol Shinde (25) and Neelam Devi (37) -- under UAPA sections 16 (punishment for terrorist act) and 18 (punishment for conspiracy, etc.) and IPC sections 120B (criminal conspiracy), 452 (trespass), 153 (wantonly giving provocation, with intent to cause riot), 186 (obstructing public servant in discharge of public functions) and 353 (assault or criminal force to deter public servant from discharge of his duty) at the Parliament Street police station, police sources said.

While police are also questioning Gurugram resident Vishal Sharma and his wife as the four arrested accused stayed at Sharma's residence on Tuesday night, suspected key conspirator Lalit Jha is on the run.

Offences punishable under the stringent Unlawful Activities (Prevention) Act are non-bailable. An official said the security agencies have not found connections with any terror group so far.

The four were associated with a social media page named 'Bhagat Singh Fan Club'. "So far, all the four accused claimed to have been self motivated and they were planning and executing the whole incident on their own," a senior officer said.

Police sources said that the scope of the probe was expanded with the role of a few more people suspected for Wednesday's security breach. The Delhi Police Special Cell has contacted Neelaksh Aish, founder of an NGO, to get further lead about suspected key conspirator Lalit Jha who is stated to be the part of a Kolkata-based NGO.