The United Democratic Madhesi Front (UDMF), an alliance of seven Madhes-based parties, accused Prime Minister KP Sharma Oli's government of using excessive force to suppress their agitation demanding more constitutional representation.
"Government is not serious enough to address the issues raised by the agitating Madhesi parties through dialogue," the Front said and asked the government to create a "conducive atmosphere" for talks.
"(It) has used violence and excessive force to suppress the movement and turned deaf ear to the call of international community, civil society and national and international rights groups to investigate into the matter," the UDMF said adding that they would stage a sit-in at Singhdurbar, the main government secretariat complex, on Monday as part of its fresh protest programmes.
Madhesis, who have been violently agitating for months and had blocked all trading points with India, protest the new Constitution of Nepal, calling it discriminatory. They allege the new charter does not safeguard their political interests.
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More than 50 people have died in the southern plains during their agitation, which had also crippled the landlocked country's economy as supplies from India were blocked.
The Front alleged that the Nepal government has not taken initiatives to treat those injured in the agitation and "not declared martyrs those who were killed during the agitation."
The Front said the government has not made public its concept regarding the 11-point demands raised by them.
"The way coalition government has made appointments to the posts of judges of the supreme court and the ambassadors to various countries, suggests that the principle of inclusiveness was totally neglected," it stated.
The Front pointed of the 21 envoys appointed, more than half were "upper-caste" Bramhins, which was contradictory to the principle of inclusiveness mention in the Constitution.