"The targeted killings of Qasem Soleimani and Abu Mahdi al Muhandi most likely violate international law incl human rights law," UN Special Rapporteur on Extra-Judicial Executions Agnes Callamard wrote on her Twitter page.
"The killing appears far more retaliatory for past acts than anticipatory for imminent self-defense," she wrote.
Report quotes Callamand as saying the notion that Suleimani was "actively developing plans" is curious both from a semantic and military standpoint.
Both Iran and the United States confirmed General Soleimani's death.