Three Bharatiya Janata Members of Parliament on Friday filed formal complaint with the Lok Sabha Secretariat over the allegations that they were offered Rs three crore each for abstaining from the United Progressive Alliance trust vote.

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The three MPs -- Ashok Argal, Mahavir Bhagora and Fagan Singh Kulste -- had been asked by the Secretariat to present their version officially to enable it to take the case forward.

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The Lok Sabha witnessed unprecedented drama on July 22 when the BJP members walked in the middle of the House, flashing wads of currency notes, claiming that it was given by a Samajwadi Party leader as bribe for abstaining from the trust vote.

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Speaker Somnath Chatterjee [Images] had stated that nobody would be spared if found guilty in the allegations of bribery to the three BJP MPs.

Describing the incident when one of the MPs displayed bundles of currency as 'most unfortunate and a very sad day in the history of Parliament', the Speaker promised that he will take all possible steps as the 'custodian of the House'.