At least seven people were killed and dozens injured Monday in a traffic accident involving three buses and several motorcycles in southern Vietnam, a policeman said. The accident occurred when a passenger bus veered into oncoming traffic on a four-lane highway, crashing into two other buses head-on and also hitting four motorbikes and one bicycle on Highway 1 in Dong Nai province, 60 kilometres north-east of Ho Chi Minh City, DPA reported.