India on Thursday rejected as completely "unwarranted and unsubstantiated" a lawsuit filed in a US court against the Indian government and certain Indian officials by Sikh separatist Gurpatwant Singh Pannun in an alleged foiled plot to assassinate him. Pannun, who heads the radical group Sikhs for Justice filed the civil lawsuit in a US federal district court in New York demanding damages for the alleged attempt to eliminate him on American soil last year. In November last year, US federal prosecutors charged Indian national Nikhil Gupta of working with an Indian government employee in the foiled plot to kill Pannun in New York. Replying to a question at a media briefing on the civil lawsuit filed by Pannun, Foreign Secretary Vikram Misri described it as "unwarranted" and "unsubstantiated imputations". Pannun, wanted in India on terror charges, holds dual citizenship of the US and Canada. "As we've said earlier, these are completely unwarranted and unsubstantiated imputations. Now