Washington, May 1 -- The United States is "regularly working" with India in its investigation into the allegations related to the plot to assassinate Sikh separatist leader Gurpatwant Singh Pannun, a US State Department official has said.The remarks by US State Department Principal Deputy Spokesperson Vedant Patel came after The Washington Post, citing unnamed sources, named a Research and Analysis Wing (RAW) officer in connection with the alleged plot to kill Pannun on American soil last year.

India on Tuesday strongly rejected the claims, saying the report made "unwarranted and unsubstantiated" imputations on a serious matter and that an investigation into the case was under way.

Addressing his daily news conference on Tuesday, Patel ...