ISLAMABAD (Online) - Protesting over death threats to country's High Commissioner to India, Shahid Malik, Pakistan on Sunday asked India to provide full security to the envoy as well as other diplomats and investigate the matter immediately. India had been told verbally and in written that it would be held responsible in case of any harm to the High Commissioner, said Foreign Office spokesman Muhammad Sadiq. "We are in touch with India and reviewing the whole situation closely", Sadiq said while confirming that Shahid Malik, Pakistan's High Commissioner to India, had received death threats via letter instead of email. "He has been threatened in the letter that he would be killed if did not leave within three days. India should ensure security to the envoy and other diplomats and sincerely investigate the matter", Sadiq said. Earlier, Pakistan's High Commissioner stationed in New Delhi had received death threats from an outfit calling itself 'All India Anti-Terrorism Group'. It had also threatened to strike at Pakistan's diplomatic mission in New Delhi and Pakistan's Parliament House. The three-page letter, mailed to the mission in New Delhi, had told the Pakistan's High Commissioner to leave India within three days otherwise he would be killed. "We don't need to make any kind of relation with Pakistan and have no place for any Pakistani in our country," the letter said, adding, "If the threat is taken lightly, it is 200 per cent sure the envoy will be killed," the letter said. The All India Anti-Terrorism Group (AIATG) also said that it had three sub-groups- Students of Hinduism Movement, Students Against Terrorism and Pride of India. It also sated that there were 11 reasons behind its formation. "You can understand we have many reasons to take lethal steps against you and your country, so tell your government that we are mad, zealot and thirsty for Pakistani blood," the letter maintained. According to All India Radio, the security of Pakistan's diplomatic mission in New Delhi has been beefed up after life threat to Pakistan's envoy Shahid Malik. The letter is also being investigated, said the Radio.