In 2013, American investigative journalist Gareth Porter cast doubt on the alleged involvement of Iran and Hezbollah, reporting that the link depended centrally on just claims from the People's Mujahedin of Iran, a controversial Iranian anti-regime group that has been described as terrorist by some nations [REF].
The Debkafile,[REF] an Israeli military intelligence website, reported on 19 February 2015 that Nisman had been killed by an Iranian posing as a defector who had spent four years to build trust.