text:  Israel responded with airstrikes on what it said were launch sites in southern Lebanon. Israel and Hezbollah have been fighting a low-grade war since Hezbollah fired on Israel after the start of the war in Gaza last year. Both sides are preparing for the possibility of an all-out war. Kat Lonsdorf, NPR News, Tel Aviv. Voting's underway across the United Kingdom, where Britons are electing a parliament and a prime minister. It's the first election there since Brexit, Britain's exit from the European Union.