Aftershocks threatened to bury more homes and block roads crucial for relief shipments, as the death toll from the earthquakes that rattled Japan’s western coastline last week surpassed 100 people on Saturday. Among the dead was a 5-year-old boy who had been recovering from injuries after boiling water spilled on him during Monday’s 7.6 magnitude earthquake. His condition suddenly worsened and he died Friday, according to Ishikawa prefecture, the hardest-hit region. Officials warned that roads, already cracked from the dozens of earthquakes that continue to shake the area, could collapse completely. That risk was growing with rain and snow expected overnight and Sunday.