IAF aircraft struck early Friday targets in the southern suburbs of Beirut where Hizbullah has its political headquarters, Lebanese security officials said. The impact of at least four missiles were heard. Anti-aircraft fire from the ground echoed in other suburbs of Beirut as the planes roared over the Lebanese capital. Hizbullah's al-Manar TV and other local stations said a bridge in the area was targeted. There was no immediate word on casualties. The IDF has said that south Beirut, a densely populated neighborhood of Shi'ite Muslims where Hizbullah has its political headquarters, could be targeted. Leaflets dropped in the evening warned people to stay away from Hizbullah offices.