The IDF began bombing Beirut's southern neighborhoods Thursday night following the firing of two rockets at the northern Israeli city of Haifa. Navy gunboats shelled Beirut's airport for the second time Thursday. Witnesses reported that two fuel tanks were hit, while large flames could be seen at the airport. Following a day of Katyusha rockets raining on northern Israel on Thursday, Prime Minister Ehud Olmert approved on Thursday night the widening of the scope of IDF targets in Lebanon. Earlier on Thursday, the IAF dropped fliers over Beirut warning residents of the city to stay clear of Hizbullah operatives, buildings and positions. Hizbullah leader, Sheikh Hassan Nasrallah, along with almost the entire Hizbullah hierarchy, reside in the same neighborhood in southern Beirut. Hizbullah had warned Israel on Thursday afternoon that if the IDF attacked southern Beirut, where the organization's leadership is based, it Hizbullah would target Haifa. "The Islamic resistance warns against targeting civilians and the infrastructure," a statement read on Hizbullah TV said. "It (resistance) specifically announces that it will quickly shell the city of Haifa and nearby areas if the southern suburbs and the city of Beirut are subjected to any direct Israeli aggression," the statement said. Earlier Thursday the IDF struck the Beirut-Damascus highway. The road serves as the main access route between Lebanon and Syria, along which people and weapons were transferred into Lebanon. Security officials said that the bombing of the road contributed to the siege that the IDF was laying on Lebanon by air, sea and ground, Army Radio reported. left two others in Hizbullah hands. Al-Jazeera reported Thursday that the soldiers were alive at the time of the kidnapping, according to a Hizbullah source. They were moved to a nearby mosque immediately after the abduction and then forced to switch clothes and taken by taxi to another location. Earlier on Thursday morning, Beirut International Airport was struck by an IAF air strike. IDF officers threatened they would bomb additional airports later in the day. Al-Jazeera reported that 15 people were killed in the airstrike. It was the first time since 1982 that the airport in south Beirut had been hit by Israel. The IDF said that the airport was targeted because it was used by Hizbullah to import weapons. The IAF attack forced the closure of the airport and the diversion of two flights to Cyprus. The army, the senior IDF source said, took into consideration the possibility that Hizbullah would fire long-range rockets at Israeli cities like Haifa and Hadera, but warned that if such attacks occurred, Israel would strike back hard, dealing a heavy blow to Lebanese government targets. He added that the Lebanese government was responsible for Wednesday's kidnapping attack on the northern border. "The bottom line is that the Lebanese government is the address, and it needs to take responsibility for what Hizbullah is doing in southern Lebanon," he emphasized. Since Wednesday, 40 targets have been hit inside Lebanon, including a home in the south that served as a Katyusha launch site. According to the IDF source, at least 30 Hizbullah operatives were killed and over 100 wounded. The attacks took place some 15 kilometers inside Lebanon. The source said that the IDF's goal "was not to chase after every Katyusha rocket in Hizbullah hands but to hit the terror group hard and to impair its ability to continue to attack Israel." "We are going to operate differently than we have in the past," he said. "We have a better ability to hit them than they have to hit us." The IDF, he added, was committed to retrieving the two IDF soldiers kidnapped in Wednesday's attack, but said the current military operation was meant to prevent other terror groups from attempting to kidnap Israeli soldiers in the future. "We will do everything we can to get them home." Earlier Thursday, IAF jets attacked Hizbullah's Al-Manar television station in the Haret Hreik district of Beirut. The station's manager Abdullah Kassir told Voice of Lebanon radio that one person had been hurt. Broadcasts were apparently continuing from the station. Hizbullah claimed immediately after the attack that broadcasts would continue from an underground section of the building. The names of six of the eight soldiers killed Wednesday in a Hizbullah attack on IDF forces patrolling the Lebanese border were released for publication Wednesday evening: Sgt. Nimrod Cohen, 19, from Mitzpe Shalem; Sgt.-Major Eyal Benin, 22, of Beersheba and Sgt.-Major Shani Turgeman, 24, of Beit Shean. All the soldiers' families have been notified. The fourth victim was later identified as Sergeant-Major Wasim Nazel, 27, from the Druze village of Kfar Yanuh. Nazel was expected to be buried Thursday at 2:30 p.m. in the military cemetery in Kfar Yanuh. Banin's funeral will take place at 4 p.m. in the military cemetery in Kiryat Shaul Turgeman will be laid to rest at 6 p.m. in the military section of the cemetery in his hometown. Cohen will also be laid to rest at 6 p.m. in Har Herzl in Jerusalem. Two of the other soldiers who were killed when the tank in which they were riding drove over an explosive device, were identified as St.-Sgt. Alexei Kashiniervski, 21, from Ness Ziona and Yaniv Bar-On, 19, from Maccabim. Under heavy fire, IDF forces continued their attempts to reclaim the bodies of the four soldiers who died when their tank was ripped apart by the blast. AP contributed to this report.