A mother and her seven-year-old son were killed in a mudslide while some 50 trucks and cars were washed away in a flash flood Friday as heavy rains lashed Japan. So far seven persons died in three days of rain. Six others remained unaccounted for by nightfall as the weather agency predicted more rain for central and western Japan, warning of the risk of more floods and landslides. The 11-year-old daughter was earlier pulled out alive from the destroyed house where her 37-year-old mother and her younger brother died. Another victim, found in Hiroshima prefecture, was a 73-year-old woman buried under mud inside her house. She was the third elderly woman to die this week in flood-hit Hiroshima. Two bodies were recovered in the central prefecture of Gifu. Authorities were also searching for an elderly man in Shimane, a woman in Hiroshima and four people still missing in Gifu. In the city of Kani in Gifu, flood water from a river washed away 28 trucks, and 20 privately owned cars from the parking lot of a transport company.