U.S. denies any role in killing Iranian scientist from Reuters: Politics WASHINGTON (Reuters) - The United States categorically denied any role in the killing of an Iranian nuclear scientist on Wednesday and called Iranian threats to close the Strait of Hormuz "dangerous and provocative." feeds.reuters.com/~r/Reuters/PoliticsNews/~3/-qy2gqRmufg/us-iran-usa-idUSTRE80A1G320120111