Israel will begin targeting leaders of Yemen’s Houthi rebel group, Defense Minister Israel Katz said Tuesday, vowing that Israel will not allow missile and drone fire on Israel to continue unchecked. Firing at Houthi leaders would seem to mark an escalation by Israel, which has so far targeted port infrastructure and military sites in a handful of sorties in response to repeated launches of drones and ballistic missiles from Yemen. A missile fired early Tuesday was shot down, but sirens in the Tel Aviv area caused widespread panic and a rush to shelter left one woman seriously injured. It was...