The toll from days of fighting between government forces and Iran-backed Houthi rebels in southwest Yemen climbed past 300 on Sunday, as hundreds of families fled their homes to escape the violence. Two military officials with the Saudi-backed government forces said that 84 of their troops were killed between midday Saturday and early Sunday morning, mostly in missile attacks. Four Houthi military sources said 57 rebel fighters were killed in the same period. The two sides have been fighting for...