Hezbollah said on Thursday Israel would pay "the price" for killing 10 people including five children in southern Lebanon, the deadliest day for Lebanese civilians in four months of hostilities across the Lebanese-Israeli border. Lebanon's Hezbollah has been trading fire with Israeli forces across the frontier since its Palestinian ally Hamas in Gaza and Israel went to war on Oct. 7. The exchanges are the deadliest since a 2006 war between Hezbollah and Israel.