actually,thats what UML and Maoists are claiming.
there are several aspects...
1.Indian Trucks couldn't enter into Nepal as Madhesis,who lives next to border crossing has called a Strike which is now running over 2 months and killed over 40.India doesn't want to risk their people's lives and property as in the past,these Nepalis burnt nearly 70 Indian trucks.
2.India is the main driving force for Nepal's constitution.It is India which diplomatically forced Maoists,UML,Nepali Congress and other parties to create a Constitution(Civil War winner Maoists previously demanded to create a Authoritarian State like China where a Communist committee will control everything and demanded to integrate their force to integrate into Nepal's Army.UML somewhat supported this line.Nepali Congress rather wanted a democracy).But after creation they somewhat ignored their "Madhesi Population",which consists over 40% of their population.These madhesis live next to the plain of Indo-Nepal Border and are somewhat marginalized.
3.India demanded to resolve this problem with dialogue with Madhesi parties before finalizing the draft of Constitution.But till now,Nepal's larger parties are ignoring this.
4.It is speculated that Nepal assured India that dialogue will take place but never happened,thats why India created an unofficial blockade.
5.Now the most important aspect,only Maoist and UML,which is somewhat closer to China and their student wings are issuing all these remarks,against which India already said that this might deteriorate the relation further.
6.Neither Nepal Government or other political parties blamed India.
read this...
The Nepal Sadbhavana Party (NSP) on Tuesday criticised the local media reports and other people who blamed the Indian counterpart for its involvement in the blockade of several freight trucks on the border.
"The Blockade has been done by Madhesi people. The people of Madhesh have sat on the border. This is being done to malign India by anti-India people in Nepal and it won't affect our relationship with India, there is nothing to worry about," President NPS, Rajendra Mahto told ANI.
Mahato also said there was a wrong propaganda being spread against India in Nepal and that Nepal media was projecting wrong news deliberately, adding that India had nothing to do with the blockade.
"This has been done earlier also that a section of people in Nepal have accused India of its involvement in the internal issues," he added.
When asked whether India was helping Madhesi's in their protest on border, Mahato said "India is only providing security to their freight carriers as there is no security from the Nepal side but there was no help by the other side in the blockade."
However, Nepal's Finance Minister Ram Sharan Mahant refuted the reports that Nepal was to redirect trade with China after undeclared blockade by India, saying "We can't fully redirect our trade with India to China due to geographical difficulties."
"It is not possible to redirect trade to China immediately," Mahat told to the local media.
Several freight trucks, including some fuel tankers, which were stranded on the Indian side for over 11 days, entered the Nepali side through different border check-points on October 4.
India Not To Blame For Border Blockade, Says Nepal Sadbhavana Party
It is reported that in Indian side,thousands of trucks are waiting to enter,which is already stretched over 10 km.some trucks are entering into Nepal gradually.