Naxalites, the country's "biggest internal security threat", seem to have spread wings and getting trained in Nepal by Maoists with Pakistan's Lashkar-e-Toiba providing help.
Worried at the development, India has submitted letters to Nepal detailing links between United Communist Party of Nepal (Maoist) and Communist Party of India (Maoist)—the umbrella outfit of Naxals in India.
Indian embassy officials confirmed that Indian Ambassador to Nepal Rakesh Sood handed over the letters to Nepal Home Minister Bhim Rawal and Foreign Minister Sujata Koirala 12 days ago.
"The letters contain information collected by Indian intelligence agencies which show Naxals getting trained in Nepal People's Liberation Army, the military wing of UCPN (M)," said an embassy official.
Sources said that Nepal government has assured a probe into the matter.
Despite claiming ideological affinity, Nepal's Maoists who joined the political mainstream two years ago after the civil war have been denying any close interaction with Indian Naxals.
The party still has control over arms and over 19000 PLA combatants, members of its military wing, reside in UN monitored camps.
India says that an agreement on providing ideological and military training was signed between PLA and Naxal leaders at Sarlahi in Nepal close to the Indo-Nepal border.
Based on that agreement, PLA allegedly provided training to nearly 200 CPI (M) cadres from Orissa, Bihar, Jharkhand and Chhattisgarh near Butwal in southern Nepal in June this year.
A LeT operative from Pakistan called Latif Khan gave explosives training to the CPI (M) cadres. He was helped by Rashid Ansari, a Nepalganj-based LeT cadre involved in fake currency racket.
The letters say 50 more CPI (M) cadress were provided training at a PLA camp in August.
As per the agreement, PLA leaders are to provide training to Naxals in Sitamarhi and Motihari districts of Bihar.
Last month, the home ministry had warned Naxalism affected states about Nepal Maoists providing training to CPI (M) cadres.
Leaders from PLA however termed the allegation as Indian propaganda to derail Nepal's ongoing peace process.