 An Israeli missile strike on Syria's capital Damascus on Saturday killed four members of Iran's Revolutionary Guards, including the head of the Forces Information Unit in Syria, a security source in the regional pro-Syria alliance told Reuters.Iana statement carried on Iranian state television. The Revolutionary Guards confirmed that four of its military advisers were killed in the Israeli strike and said further details would be announced later. State TV said the targeted building was the residence of Iranian advisers in Damascus, media Sana said the attack on Saturday took place in the Matze neighborhood. It said Israeli aggression targeted the building.A well-informed source told Al Jazeera the target was an IRGC intelligence unit, adding that a senior IRGC intelligence official in Syria and his assistants were in the building. In a brief statement, the IRGC said an airstrike by Israeli fighter jets killed a number of Syrian forces and four military advisers, without mentioning their names for their titles. Iranian state television called it a terrorist attack by Israel, Iranian state media reported the attack, which is believed to have been carried out with at least four missiles, the Syrian Observatory for Human Rights, a Britain-based monitor that relies on a network of sources on the ground, said the attack killed five people in a building where Iranoline leaders were meeting. An Israeli missile strike targeted a four-story building, killing five people and destroying the whole building. Where Iranoline leaders were meeting, said the Syrian Observatory.