India on Thursday described as a “matter of concern” the US charging an Indian national with conspiring to kill a Sikh separatist on American soil, and asserted that a high-level probe committee will investigate all aspects of the case.

India has constituted a probe team to investigate allegations relating to the foiled plot to kill Gurpatwant Singh Pannun. Nikhil Gupta, 52, was charged on Wednesday with murder-for-hire in connection with his participation in a foiled plot to assassinate a US citizen in New York City.