Landslides and floods triggered by heavy rains brought by storm Prapiroon have killed seven and left nine missing in northern Vietnam, authorities said Thursday. More than 600 houses have been destroyed or damaged amid the severe weather in provinces including Son La, Hoa Binh and Dien Bien, the National Committee for Disaster Prevention and Control said. Among the latest victims were a mother and her child killed by a landslide in Dien Bien province. The landslide also destroyed two houses, leaving 5 missing, the Dien Bien provincial Committee for Disaster Prevention and Control said in a rep…