The Middle East is bracing for a potential flare-up in violence after Israeli authorities said a rocket from Lebanon struck a soccer field in the Israeli-controlled Golan Heights. It killed 12 children and teens in what the Israeli military said was the deadliest attack on civilians since Oct. 7. The strike raised fears of a broader regional war between Israel and Hezbollah, which has denied a role in the attack. Saturday’s attack comes at a sensitive time, as Israel and Hamas are negotiating a cease-fire proposal to end the nearly 10-month war in Gaza and free the roughly 110 hostages who remain captive there.