BEIRUT — Lebanon’s Hezbollah fired a massive barrage of rockets into northern Israel on Wednesday to avenge the killing of a top commander, further escalating regional tensions as the fate of an internationally-backed plan for a ceasefire in Gaza hung in the balance. [time-brightcove not-tgx=”true”] The retaliatory attack came as U.S. Secretary of State Antony Blinken was in the region to push a ceasefire proposal with global support that has not been fully embraced by Israel or Hamas.