A fierce firefight in a Beirut housing block.<br/> <br />The fighting between Lebanese army soldiers and unknown gunmen broke out Wednesday night and lasted until Thursday morning.<br/> <br />According to a security source, two men were killed and two others were arrested when the army raided the building where the gunmen were taking shelter.<br/> <br />Officials at the scene said the soldiers seized weapons and ammunition inside one of the gunmen's apartment.<br/> <br />At least four soldiers were injured in the exchange.<br/> <br />The violence in neighbouring Syria has seen a spillover into Lebanon in recent days.<br/> <br />In the country's complex politics, the main governing party is sympathetic to Syrian President Bashar al-Assad.<br/> <br />But the main Lebanese opposition supports the Syrian rebels fighting for his downfall.<br/> <br />At least nine people have already been killed in gunbattles in Lebanon's northern city of Tripoli and in Beirut.<br/> <br />Travis Brecher, Reuters