 While in Lebanon, the group received training, support and other backing from Hezbollah and its backers in Iran, and developed a close relationship with the organization.In 1990, the headquarters of PIJ moved to the Syrian capital, Damascus, where it continues to be based, with offices in Beirut, Tehran, and Khartoum.PIJ masterminded several suicide bombings in Israel, the first one being the Tel Aviv–Jerusalem bus 405 suicide attack in 1989 which resulted in 16 civilian deaths.