So was the master mind of the Iranian plot in DC a member of Mujahideen Khalq?

"If Mr. Shakuri were in fact a member of the opposition group, it would be an embarrassing turn for the United States, which announced the suspected plot with some fanfare a week ago in a televised news conference by Attorney General Eric. H. Holder Jr., who said American investigators believed high officials in Iran’s government were responsible."  If the country accused by the Obama administration is not Iran, US Congress would be holding hearings on this scandal.