Did Hezbollah assassinate Lebanese Prime Minister Rafik Hariri in 2005? The United Nations team investigating the incident is taking its time and treading lightly on the sensitive political mater. Hezbollah has significant political power in Lebanon. The government of Syria which has connections to Hezbollah is also being investigated. Hezbollah leader Hassan Nasrallah says that Israel is behind the killing, although the United Nations team is not investigating Israel for any involvement. He added that the UN investigation is an Israeli plot.