KATHMANDU (AFP) - India has written to the government of Nepal to protest the alleged training of Indian Maoist rebels in the country, Nepals Foreign Ministry said Saturday. Indias ambassador made the allegation in a formal letter of protest to Nepals caretaker government last week, the Ministry said. Embassy sources who spoke on condition of anonymity told AFP there was evidence the Indian rebels had received ideological and military training in Nepal, which suffered its own Maoist insurgency between 1996 and 2006. Since then the former guerrillas have transformed themselves into Nepals biggest political force, winning 2008 elections, and they are now the main opposition party. We have received a letter from the Indian ambassador expressing concern about Naxalite training having taken place in Nepal. This is a serious matter, Foreign Minister Sujata Koirala said. The Indian embassy gave no time frame for when the training took place but Nepalese media reports said it occurred recently. Indias embassy to Nepal confirmed that a letter had been sent, but refused to divulge the details of its contents. Indian ambassador to Nepal Rakesh Sood handed letters of concern to the ministries, spokeswoman Apoorva Srivastava told AFP, referring to Nepals home and foreign ministries. The letter is about links between Nepals Maoists and Indias Naxalites. Nepals Maoist party denied any involvement in training Indian guerrillas. We are in the middle of a peace process so that would make no sense. Our party has not trained and will not train Indian Maoists, senior party leader Chandra Prakash Gajurel told AFP.