The Maoists had earlier refused to join the assembly after their rout in the November 19 polls, which they claimed was rigged.
The Nepali Congress (NC), the Communist Party of Nepal-Unified Marxist Leninist (CPN-UML) and the United Communist Party of Nepal-Maoist (UCPN-M) have agreed on a four-point accord, incuding the formation of a parliamentary panel to look into alleged rigging, NC leader Prakash Man Singh told PTI.
The agreement does not mention who will head the probe into the rigging allegations. The Maoists have been demanding that party chief Prachanda should be made the permanent head of the mechanism.
They agreed in principle to draft the new constitution within six months and promulgate it in a year.
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With this agreement in place, the parties are likely to request the Election Commission to again extend a deadline to submit the names of candidates for seats in the Constituent Assembly under the Proportional Representation system. An earlier deadline set by the poll panel will end tomorrow.
The formation of the new Constituent Assembly is vital for completing a peace process after the 10-year civil war that killed an estimated 16,000 people.