Rescue crews searched desperately Sunday amid shattered homes and tangled debris for dozens of people still missing after record-breaking rain sent floodwaters surging through Middle Tennessee. At least 10 people were killed, including twin toddlers who were swept from their father's arms, according to surviving family members. Authorities feared the death toll could rise. The flooding in rural areas took out roads, cellphone towers and telephone lines, leaving families uncertain about whether their loved ones survived the unprecedented deluge. Emergency workers were searching door to door, said Kristi Brown, a coordinator for health and safety supervisor with Humphreys County Schools....