A baby and a five-year-old girl were killed in an explosion east of Vietnam's capital Hanoi early Wednesday that destroyed several houses and wounded at least six other people.Authorities are investigating the cause of the blast in Bac Ninh province's Yen Phong district, which occurred at 4:30 am demolishing buildings and sending debris flying through the air.The explosion completely razed five homes and shattered the windows of surrounding buildings, according to an AFP reporter at