Opposition lawmakers kept on chanting slogans and rushed to the well of the Constituent Assembly even as Chairman Subas Nembang was addressing the meeting.
The UCPN (Maoist)-led alliance of 19 parties has been obstructing the Constituent Assembly (CA) meet since Monday to prevent the process of forming a Questionnaire Committee for resolving the sticky issues of Constitution through a vote.
The opposition leaders including Maoist supremo Prachanda, Vice-chairman Baburam Bhattarai and Madhesi Peoples Rights Forum Nepal president Upendra Yadav, shouted anti-government slogans and encircled the rostrum as soon as the meeting started.
After disruptions and chaos reigned in the assembly for the better part of the day, top leaders of four major political forces -- Nepali Congress, CPN-UML, UCPN-Maoist and Madhesi Front-- informally held a meeting inside the Constituent Assembly building.
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In the presence of the Chairman, they sat together to discuss the future course of the Constituent Assembly, and how to move ahead as today's midnight deadline was ending without delivering the statute.
More than 1,500 armed policemen have been deployed in and around the Parliament building to prevent any untoward incident.
The ruling and opposition alliances are sharply divided on key issues of the Constitution drafting including federal structure and forms of governance.
A brawl in the Constituent Assembly on Tuesday had left 14 people, including two senior lawmakers, injured.
It is almost certain that tonight's deadline will pass without the promulgation of the Constitution despite a commitment made in this regard by the parties last year.
Nepali Congress and CPN-UML command more than two-thirds majority in the 601-member Constituent Assembly which is required for the drafting of the Constitution. However, the opposition alliance is demanding promulgation of the Constitution through consensus.
Opposition parties' key demands include ethnic identity- based federal structure.