BEIRUT --- The leader of the Lebanese militia Hezbollah said Friday that his group must retaliate after a presumed Israeli strike hit a Beirut neighborhood this week, killing a senior Hamas official, or else all of Lebanon would be vulnerable to Israeli attack. Hassan Nasrallah appeared to be making the case for a response to the Lebanese public, even at the risk of escalating the fighting between Hezbollah and Israel. But he did not indicate how or when the militants would act. The strike that killed Hamas' deputy political leader, Saleh Arouri, threatened months of efforts by the United States to prevent the war in Gaza from spiraling into a regional conflict. Nasrallah sa...Keep on reading: Hezbollah chief wants reprisal for suspected Israeli strike in Beirut