BEIRUT, Lebanon | Running gunbattles raged in parts of Beirut on Thursday after the leader of Hezbollah accused Lebanon&#8217;s Western-backed government of declaring war on his Shiite militant group.</p><p>At least four people were killed and eight wounded in the capital.</p><p>In a grim reminder of Lebanon&#8217;s 1975-90 civil war, factions threw up roadblocks and checkpoints dividing Beirut into sectarian enclaves on the second day of clashes between Sunni Muslims loyal to the government and Shiite supporters of Hezbollah.</p><p>A top Sunni leader went on television urging Hezbollah to pull its fighters back and &#8220;save Lebanon from hell.&#8221;</p><p>The army, which has stayed out of the sectarian political squabbling that has paralyzed the country for more than a year, did not intervene in the battles.</p><p>The chattering of automatic weapons and thumps of exploding rocket-propelled grenades echoed across Beirut into the night. People huddled in hallways and stairwells as gunmen rushed from one street corner to the next firing at their foes. Some families fled to neighborhoods that remained quiet.</p><p>The unrest virtually shut down Lebanon&#8217;s international airport for a second day and barricades closed major highways.</p><p>Fighting intensified minutes after Hezbollah leader Hassan Nasrallah made a televised address charging that the government had declared war on his group when it decided this week to shut down Hezbollah&#8217;s private telecommunications network.</p><p>&#8220;Those who try to arrest us, we will arrest them. Those who shoot at us, we will shoot at them. The hand raised against us, we will cut it off,&#8221; Nasrallah said in a news conference via video link from his hiding place.